Overview of Trifluoromethanesulfonate Salts and Related Products: Structural Features, Common Classes, and Typical Applications

Why devote a separate discussion to “trifluoromethanesulfonate salts”?

In organic synthesis, organometallic catalysis, electrochemistry, photolithography, and functional materials, one frequently encounters the abbreviations “TfOH”, “OTf”, “triflate”, and “triflic”. All of these are closely associated with trifluoromethanesulfonic acid (CF₃SO₃H, triflic acid) and its derivatives.

Trifluoromethanesulfonic acid has the following features:

1. It is a superstrong Brønsted acid, with extremely high acidity.

2. Its conjugate base is the trifluoromethanesulfonate anion (CF₃SO₃⁻, commonly abbreviated as OTf⁻ or TfO⁻).

3. The anion is stable and weakly coordinating, and therefore interferes only minimally with the reactivity of the cation.

Around this combination of a “superstrong acid + weakly coordinating anion”, an extensive family of trifluoromethanesulfonate salts and related compounds has been developed. For ease of understanding and product selection, this article classifies these compounds into six categories (A–F) according to their structures and applications:

1. Category A: Halonium / sulfonium trifluoromethanesulfonate salts (photoacid generator type)

2. Category B: Organic cation / ionic-liquid-type trifluoromethanesulfonate salts

3. Category C: Organic trifluoromethanesulfonate esters and bis(trifluoromethanesulfonate esters)

4. Category D: Transition-metal trifluoromethanesulfonate complexes / catalysts

5. Category E: Simple metal trifluoromethanesulfonate salts

6. Category F: Neat trifluoromethanesulfonic acid and functionalization reagents

These six categories will be introduced in the order A → B → C → D → E → F, focusing on their structural characteristics and representative applications. Correspondingly, the “Category” column in the product list uses the same A–F labels and names, and lists several representative products under each category to help bridge the concepts with specific compounds.

Typical Features of Trifluoromethanesulfonic Acid–Based Systems:

Strongly Acidic Environment + Weakly Coordinating Anion

Before discussing categories A–F in detail, it is helpful to highlight a few common features of trifluoromethanesulfonate-based systems:

1. Strong Brønsted / Lewis acidity

1. Trifluoromethanesulfonic acid itself is a superacid.

2. Certain metal trifluoromethanesulfonate salts are strong Lewis acids.

3. Some organic triflates (such as methyl trifluoromethanesulfonate) are extremely powerful electrophilic reagents.

2. Stable, weakly coordinating anion

1. In OTf⁻, the strongly electron-withdrawing CF₃ group and the two S=O groups, together with resonance stabilization, lead to a highly delocalized charge.

2. As a result, OTf⁻ is generally regarded as a “weakly coordinating” anion that does not readily occupy metal centers or participate in side reactions.

3. Good solubility and compatibility

1. Many trifluoromethanesulfonate salts are highly soluble in polar organic solvents and ionic liquids.

2. This is advantageous for homogeneous catalysis, organic synthesis, and electrochemical experiments.

In other words, they can be viewed as a coherent toolbox designed to “let the cation do the chemistry, while the anion quietly maintains charge balance in the background.”

Category A: Halonium / Sulfonium Trifluoromethanesulfonates (Photoacid Generator Type)

Typical structures

1. Iodonium trifluoromethanesulfonates (iodonium triflates)

A hypervalent iodine center bonded to two aryl groups, forming a salt with OTf⁻.

2. Sulfonium trifluoromethanesulfonates (sulfonium triflates)

A positively charged sulfur center bonded to three aryl groups, forming a salt with OTf⁻.

Main functions

1. Photoacid generators (PAGs)

1. Under UV or deep-UV irradiation, these cations undergo cleavage to generate:

(a) A strong acid (trifluoromethanesulfonic acid);

(b) Radicals or cationic intermediates.

2. The acid thus formed can:

(a) Initiate cationic polymerization of monomers such as epoxides and vinyl ethers;

(b) Trigger deprotection, crosslinking, and related transformations.

2. Electronic / lithographic materials

1. Widely used in photoresists, UV-curable coatings, and 3D printing resins;

2. Certain structures impose stringent constraints on metal impurity levels and are employed in microelectronics manufacturing.

3. Arylation reagents

1. Some iodonium triflates can act as “aryl donors” under metal catalysis;

2. Enabling mild C–C, C–N, and C–O arylation reactions.

Example use scenarios

1. Situations where acidity needs to be triggered by UV light, such as photolithography, micro-/nanofabrication, or UV curing.

2. Aryl-transfer reactions that must proceed under relatively mild conditions.

Category B: Organic Cation / Ionic-Liquid-Type Trifluoromethanesulfonates

Typical cation types

1. Imidazolium

2. Pyridinium

3. Quaternary ammonium, etc.

When paired with OTf⁻, many of these compounds are liquids or low-melting solids, and thus belong to—or are close to—the class of ionic liquids.

Key features

1. High polarity and good ionic conductivity.

2. Low vapor pressure and negligible volatility.

3. Cations and anions are structurally tunable, allowing adjustment of properties such as hydrophobicity, viscosity, and coordinating ability.

Typical applications

1. Green solvents and reaction media

(a) Can replace part of the volatile organic solvent usage;

(b) Commonly employed in acid-catalyzed reactions, extraction, and separation.

2. Electrochemical electrolytes / ionic conductors

(a) Can serve as components of electrolytes in batteries, supercapacitors, and electrocatalytic systems.

3. Phase-transfer catalysts / acidic auxiliary media

(a) Triflate salts bearing pyridinium or quaternary ammonium cations facilitate transfer of inorganic ions into the organic phase;

(b) Provide a stable acidic microenvironment under nonaqueous conditions.

4. Organic radical precursors

(a) Certain specially designed organic cation triflates can generate persistent radicals under photochemical or electrochemical conditions, enabling C–H functionalization, decarboxylative coupling, and other “modern organic synthesis” transformations.

Example use scenarios

1. Building ionic-liquid systems or green solvent systems.

2. Conducting phase-transfer reactions in aqueous/organic biphasic media.

3. Performing electrochemical experiments, electrocatalysis, or CO₂ capture studies.

Category C: Organic Trifluoromethanesulfonate Esters and Bis(Trifluoromethanesulfonate Esters)

General structural formula

R–O–SO₂CF₃

Here, R is typically an aromatic or heteroaromatic framework such as benzene, naphthalene, binaphthyl, anthracene, fluorescein, etc.

Key point

OTf is an excellent leaving group and performs particularly well in transition-metal-catalyzed cross-coupling reactions.

1. Applications in cross-coupling reactions

1. In Pd, Ni, and Cu catalytic systems, aryl / heteroaryl triflates are often used as functional equivalents of aryl halides:

(a) Suzuki coupling: with boronic acids / boronate esters;

(b) Negishi / Stille coupling: with organozinc / organotin reagents;

(c) Other C–N, C–O, and related coupling reactions.

2. They are particularly suitable for aryl positions that are difficult to access by direct halogenation:

phenols or alcohols can first be converted to triflates and then subjected to cross-coupling.

2. Functional materials and conjugated monomers

1. Bis(trifluoromethanesulfonate esters) based on benzene or naphthalene backbones are commonly used as monomers for conjugated polymers:

(a) They couple with various aryl boronic acids or organometallic reagents to construct π-conjugated backbones and side chains for OLED, OPV, OFET, and related materials.

3. Chiral building blocks

1. Binaphthyl-based chiral bis(trifluoromethanesulfonate esters) are important intermediates for the preparation of chiral ligands and chiral heteroaromatic structures.

They can be further transformed into a wide range of chiral small organic molecules and metal ligands.

Example use scenarios

1. Constructing complex aryl, biaryl, and naphthyl architectures.

2. Synthesizing monomers for luminescent / conductive π-conjugated materials.

3. Preparing chiral ligands and other chiral building blocks.

Category D: Transition-Metal Trifluoromethanesulfonate Complexes / Catalysts

These compounds typically have the general form:

M(L)_n(OTf)_x or M(OTf)_x(L)_n

where M is commonly a transition metal such as Rh, Ru, Pd, Ti, Zr, Cu, or Co, and L represents ligands such as phosphines, binaphthyl phosphines, cyclooctadiene, cyclopentadienyl, and related organic ligands.

Why are OTf⁻ anions favored as counterions?

1. OTf⁻ is usually only weakly coordinating and does not readily “compete for” coordination sites at the metal center.

2. This facilitates binding of substrates or key functional ligands to the metal center.

3. At the same time, OTf⁻ improves solubility and maintains charge neutrality, serving as an excellent “background anion”.

1. Asymmetric catalysis

1. Rh–OTf systems combined with chiral phosphine ligands (such as DUPHOS, BINAP, etc.) are widely used catalysts for asymmetric hydrogenation and addition reactions.

2. They are applicable to the synthesis of chiral amines, chiral alcohols, and chiral pharmaceutical intermediates.

2. C–H activation and transfer hydrogenation

1. Cp*Ru–OTf and certain Rh–OTf and Ir–OTf complexes are widely used in:

(a) C–H functionalization and direct alkylation / arylation of aromatic rings;

(b) Transfer hydrogenation and borrowing-hydrogen transformations.

3. Polymerization and insertion reactions

1. Metallocene Ti/Zr triflate systems perform well in olefin polymerization, organometallic insertion, and cyclization reactions, and are useful in both polymer synthesis and fine organic synthesis.

4. General Pd(II) sources

1. Certain Pd(II) triflate complexes bearing acetonitrile ligands:

(a) Have good solubility and readily undergo ligand exchange;

(b) Are convenient Pd(II) sources for C–C / C–N coupling and oxidative transformations.

Example use scenarios

1. Designing asymmetric catalytic systems.

2. Studying modern catalytic reactions such as C–H activation and transfer hydrogenation.

3. Carrying out olefin polymerization and insertion reactions.

4. Using a Pd catalyst precursor with tunable ligands.

Category E: Simple Metal Trifluoromethanesulfonate Salts

This category comprises the most “straightforward” trifluoromethanesulfonate salts, with a general formula of:

M(OTf)_n

where M may be an alkali metal (Li, Na, K, etc.), an alkaline-earth metal, a transition metal, or a rare-earth metal.

1. Electrolytes and components of ionic liquids

1. Trifluoromethanesulfonates of Li, Na, and K are commonly used as:

(a) Electrolyte salts in organic electrolyte systems;

(b) Components in ionic-liquid formulations;

(c) Background salts in nonaqueous media (to provide ionic strength).

2. Lewis acid catalysts

1. Al(OTf)₃, CuOTf, and related salts are widely used Lewis acids:

(a) Applicable to Friedel–Crafts reactions;

(b) Catalyze alkylation, acylation, addition, and rearrangement reactions;

(c) Also act as activators in certain coupling and multicomponent reactions.

3. Metal sources and coordination precursors

1. Rare-earth and transition-metal triflates can also serve as:

(a) Precursors for the synthesis of more complex coordination compounds;

(b) Dopant sources and luminescent centers in functional materials.

Example use scenarios

1. When a metal salt with a non-interfering, weakly coordinating anion is needed as an electrolyte or background salt.

2. When a strongly Lewis-acidic reaction environment is required, but the anion itself should minimally affect the reaction mechanism.

Category F: Neat Trifluoromethanesulfonic Acid and Functionalization Reagents

This category includes:

1. Neat trifluoromethanesulfonic acid and isotopically labeled variants (e.g., TfOD);

2. Methyl trifluoromethanesulfonate and its isotopically labeled analogues;

3. Silyl trifluoromethanesulfonates such as trimethylsilyl trifluoromethanesulfonate;

4. Boron-based Lewis acids such as dibutylboron trifluoromethanesulfonate.

1. Methyl trifluoromethanesulfonates (MeOTf series)

1. Extremely powerful electrophilic methylating reagents, capable of methylating:

(a) Alcohols, phenols, and carboxylic acids;

(b) Amines and amides;

(c) Certain aromatic rings.

2. Isotopically labeled forms (e.g., CD₃–OTf, ¹³CH₃–OTf):

(a) Used to prepare isotopically labeled drug molecules and metabolites;

(b) Used in combination with NMR and mass spectrometry for mechanistic studies and metabolic tracing.

2. Silyl trifluoromethanesulfonates: e.g., TMSOTf

1. Combine strong Lewis acidity with strong electrophilic silyl character:

(a) Assist in carbonyl activation, promoting condensations and cyclizations;

(b) Used in carbohydrate chemistry for glycosidic bond formation;

(c) Used in protecting-group chemistry for the installation or removal of certain silyl protecting groups.

3. Boron-based Lewis acids: e.g., Bu₂BOTf

1. Commonly used for generating enol boronates and participating in stereoselective aldol and related reactions;

2. Widely applied in carbonyl chemistry as a powerful tool for controlling stereochemistry and selectivity.

4. Safety notes

1. Strong methylating reagents such as methyl trifluoromethanesulfonate generally exhibit high toxicity and potential mutagenicity.

2. Trifluoromethanesulfonic acid, silyl trifluoromethanesulfonates, and certain metal triflates are highly corrosive and/or strongly acidic.

3. Appropriate laboratory safety procedures must therefore be followed:

(a) Handle in a fume hood;

(b) Wear suitable gloves, safety goggles, and a lab coat;

(c) Store and dispose of waste solutions properly; do not discharge them indiscriminately.

Application-Driven “Quick Selection” Guide

Based on the six categories described above, you can work backward from the target application to identify the appropriate class of products:

1. Photolithography, UV curing, or photoinduced polymerization?

→ Focus on Category A: Halonium / sulfonium trifluoromethanesulfonates (photoacid generators).

2. Need ionic liquids, special electrolytes, or phase-transfer systems?

→ Focus on Category B: Organic cation / ionic-liquid-type trifluoromethanesulfonates.

→ Optionally combine with Category E: Simple metal trifluoromethanesulfonate salts to provide metal cations.

3. Cross-coupling to build aryl / naphthyl / conjugated π systems?

→ Focus on Category C: Organic trifluoromethanesulfonate esters and bis(trifluoromethanesulfonate esters).

4. Studying organometallic catalysis, asymmetric reactions, or C–H activation?

→ Focus on Category D: Transition-metal trifluoromethanesulfonate complexes / catalysts.

5. Need strong Brønsted acids, strong Lewis acids, isotopic labeling, or powerful methylation / silylation reagents?

→ Focus on Category F: Neat trifluoromethanesulfonic acid and functionalization reagents.

→ Combine with Category E: Simple metal triflates to fine-tune system acidity and coordination properties.

Representative Aladdin Trifluoromethanesulfonate Products

The table below lists representative products from each category.

For a more complete overview of the product range, please search for specific items on the website by product name or CAS number, or refer to the “Trifluoromethanesulfonate Product List” in the appendix at the end of this article.

Category	Subcategory (Structure / Application Positioning)	Cat. No.	Name	CAS No.	Spec / Purity	Structure / Features	Key Application Points
A Halonium / Sulfonium Trifluoromethanesulfonates (Photoacid Generators)	Halonium trifluoromethanesulfonate · Photoacid generator	B405225	Bis(2,4,6-trimethylphenyl)iodonium trifluoromethanesulfonate	139139-80-3	≥98%	Typical diaryliodonium trifluoromethanesulfonate bearing two mesityl aryl groups; excellent thermal stability	Common photoacid generator / photoinitiator used in UV curing, lithography, and cationic polymerization systems
A Halonium / Sulfonium	Halonium trifluoromethanesulfonate · Photoacid generator	B152266	Bis(4-tert-butylphenyl)iodonium trifluoromethanesulfonate	84563-54-2	≥98%	Para-tert-butyl-substituted diaryliodonium triflate with high hydrophobicity	Photoacid generator for electronic materials, thick-film photoresists, and resist formulations
A Halonium / Sulfonium	Halonium trifluoromethanesulfonate · Further functionalizable	B405226	Bis(4-bromophenyl)iodonium trifluoromethanesulfonate	139139-81-4	≥98%	Para-bromo-substituted diaryliodonium triflate; Br positions can undergo further coupling	Functions both as a photoacid generator and as an arylation reagent in coupling / crosslinking reactions
A Halonium / Sulfonium	Sulfonium trifluoromethanesulfonate · High-activity photoacid generator	D174313	Diphenyl(trifluoromethyl)sulfonium trifluoromethanesulfonate	147531-11-1	≥97%	Triarylsulfonium cation containing a CF₃ group, with strong light absorption and high acid generation efficiency	High-activity photoacid generator suitable for deep-UV exposure and fast-curing systems
A Halonium / Sulfonium	Sulfonium trifluoromethanesulfonate · Functional photoactive monomer	E175884	Diphenyl(vinyl)sulfonium trifluoromethanesulfonate	247129-88-0	≥97%	Triarylsulfonium framework bearing a vinyl group, enabling copolymerization / crosslinking	Dual-function photoacid generator and photoactive monomer for coatings, resin modification, and network crosslinking
A Halonium / Sulfonium	Triarylsulfonium trifluoromethanesulfonate · Electronic-grade lithography material	T476344	Tris(4-tert-butylphenyl)sulfonium trifluoromethanesulfonate	134708-14-8	Electronic grade, ≥99% metals basis	Bulky triarylsulfonium cation with extremely low metal impurity levels	Photoacid generator for high-end microelectronics / photoresist systems, suitable for applications highly sensitive to metal ions
B Organic Cation / Ionic-Liquid Trifluoromethanesulfonates	Imidazolium ionic-liquid trifluoromethanesulfonate	B111364	1-Butyl-3-methylimidazolium trifluoromethanesulfonate	174899-66-2	≥97%	Classic BMIM OTf ionic liquid with low melting point and high polarity	Green solvent, electrochemical electrolyte, reaction medium for catalysis, and extraction / separation
B Organic Cation / Ionic Liquid	Imidazolium ionic-liquid trifluoromethanesulfonate	E101508	1-Ethyl-3-methylimidazolium trifluoromethanesulfonate (EMIM OTf)	145022-44-2	≥98%	EMIM cation + OTf⁻; lower viscosity and improved mass transfer	Electrolyte and ionic-liquid solvent for organic synthesis, electrochemistry, and CO₂ absorption
B Organic Cation / Ionic Liquid	Long-chain imidazolium ionic-liquid trifluoromethanesulfonate	D589062	1-Decyl-3-methyl-1H-imidazol-3-ium trifluoromethanesulfonate	412009-62-2	≥98%	C₁₀ long-chain substituent with pronounced hydrophobicity and surface activity	Surface-active ionic liquid for biphasic catalysis, interfacial reactions, and functional materials
B Organic Cation / Ionic Liquid	Pyridinium trifluoromethanesulfonate	N770263	N-Butylpyridinium trifluoromethanesulfonate	390423-43-5	≥98%	N-butylpyridinium quaternary-ammonium-type cation + OTf⁻	Phase-transfer catalyst, organic acidic medium in polar solvents, electrochemical electrolyte
B Organic Cation / Ionic Liquid	Quaternary ammonium trifluoromethanesulfonate	T162047	Tetrabutylammonium trifluoromethanesulfonate	35895-70-6	≥98%	TBA⁺ + OTf⁻; bulky tetraalkylammonium cation that is essentially non-coordinating in most systems	Phase-transfer catalysis, electrolyte salt, counterion in ionic liquids or metal OTf systems
B Organic Cation / Ionic Liquid	Organic cation trifluoromethanesulfonate · Radical precursor	N343104	N-Hydroxynaphthalene-2,3-dicarboximide trifluoromethanesulfonate	85342-62-7	≥98%	NHP⁺–OTf⁻; readily generates NHP radicals	Radical precursor in photochemical / electrochemical reactions for C–H functionalization and C–C bond formation
C Organic Trifluoromethanesulfonate Esters / Bis(Trifluoromethanesulfonate Esters)	Chiral aromatic bis(trifluoromethanesulfonate ester) building block	B115801	(R)-(-)-1,1'-Binaphthyl-2,2'-diyl bis(trifluoromethanesulfonate)	126613-06-7	≥98%	(R)-BINOL ditriflate, chiral bis-aryl trifluoromethanesulfonate ester	Aryl source in Suzuki and related couplings; precursor for chiral phosphine ligands and chiral alcohol derivatives
C Organic Trifluoromethanesulfonate Esters	Aromatic bis(trifluoromethanesulfonate ester) building block	B166852	1,1'-Binaphthyl-2,2'-diyl bis(trifluoromethanesulfonate)	128575-34-8	≥97%	BINOL-framework ditriflate (racemic)	Used in functional materials, ligand and intermediate synthesis; excellent leaving group in cross-coupling reactions
C Organic Trifluoromethanesulfonate Esters	π-Conjugated phenylene bis(trifluoromethanesulfonate) monomer	B304142	2,5-Bis(trimethylsilyl)-1,4-phenylene bis(trifluoromethanesulfonate)	613676-07-6	≥98%	p-Phenylene ditriflate with TMS protection to improve solubility and stability	Monomer for conjugated polymers and OLED/OPV materials; suitable for Suzuki / Stille coupling
C Organic Trifluoromethanesulfonate Esters	π-Conjugated naphthalene bis(trifluoromethanesulfonate) monomer	B405207	3,6-Bis(trimethylsilyl)naphthalene-2,7-diyl bis(trifluoromethanesulfonate)	947488-89-3	≥95%	Naphthalene-2,7-ditriflate with TMS protection	Building block for luminescent materials and conjugated polymers; used to construct linear / star-shaped π-conjugated systems
C Organic Trifluoromethanesulfonate Esters	Aromatic trifluoromethanesulfonate · CF₃-aryl source	T587297	4-(Trifluoromethyl)phenyl trifluoromethanesulfonate	146397-87-7	≥98%	Para-CF₃-substituted aryl OTf	CF₃–Ph building block in cross-coupling reactions for pharmaceutical and agrochemical intermediate synthesis
C Organic Trifluoromethanesulfonate Esters	Aromatic trifluoromethanesulfonate · Naphthyl source	N697583	Naphthalen-1-yl trifluoromethanesulfonate	99747-74-7	≥97%	Naphthyl OTf, a highly reactive aromatic triflate	Used in Suzuki / Negishi and related couplings for 1-substituted naphthalene derivatives and OLED materials
D Transition-Metal Trifluoromethanesulfonate Complexes / Catalysts	Rh(I)–COD trifluoromethanesulfonate complex	B284034	Bis(1,5-cyclooctadiene)rhodium(I) trifluoromethanesulfonate	99326-34-8	≥99.95% metals basis	[Rh(COD)₂]OTf structure; classic Rh(I) catalyst precursor	Homogeneous catalyst for hydroformylation, olefin hydrogenation, and olefin functionalization
D Metal Complexes / Catalysts	Chiral Rh–DUPHOS trifluoromethanesulfonate complex	B282806	1,2-Bis[(2R,5R)-2,5-dimethylphospholano]benzene(1,5-cyclooctadiene)rhodium(I) trifluoromethanesulfonate	187682-63-9	≥98%	(R,R)-Me-DUPHOS–Rh–COD chiral Rh(I) complex	Asymmetric hydrogenation / addition; synthesis of chiral pharmaceuticals and fine chemicals with high enantiomeric excess
D Metal Complexes / Catalysts	Chiral Rh–DUPHOS trifluoromethanesulfonate complex	B282803	(-)-1,2-Bis[(2R,5R)-2,5-diethylphospholano]benzene(1,5-cyclooctadiene)rhodium(I) trifluoromethanesulfonate	136705-77-6	≥98%	(R,R)-Et-DUPHOS–Rh–COD chiral Rh(I) catalyst	Asymmetric catalysis (e.g., olefin hydrogenation), especially suitable for more hydrophobic substrates
D Metal Complexes / Catalysts	Pd(II)–acetonitrile trifluoromethanesulfonate complex	T161507	Tetrakis(acetonitrile)palladium(II) bis(trifluoromethanesulfonate)	68569-14-2	≥95%	Pd(MeCN)₄(OTf)₂ with good solubility and easily exchangeable ligands	General Pd(II) source for C–C / C–N coupling, oxidative transformations, and ligand screening
D Metal Complexes / Catalysts	Metallocene–Ti trifluoromethanesulfonate complex	T161481	Bis(trifluoromethanesulfonato)titanocene	76262-87-8	≥97% (T)	Cp₂Ti(OTf)₂ with strong Lewis acidity	Lewis acid catalyst for Friedel–Crafts reactions, cyclizations, and olefin polymerizations
D Metal Complexes / Catalysts	Metallocene–Zr trifluoromethanesulfonate complex	Z162994	Bis(trifluoromethanesulfonato)zirconocene tetrahydrofuran complex	89672-77-5	≥97% (T)	Cp₂Zr(OTf)₂·THF stable complex	Catalyst for organometallic polymerization, insertion / cyclization reactions, and fine organic synthesis
D Metal Complexes / Catalysts	Cp*Ru–trifluoromethanesulfonate complex	T299624	Tris(acetonitrile)(pentamethylcyclopentadienyl)ruthenium(II) trifluoromethanesulfonate	113860-02-9	≥95%	Cp*Ru(MeCN)₃OTf, a 16-electron Ru(II) complex	Homogeneous Ru catalyst for C–H activation, transfer hydrogenation, and alkylation reactions
E Simple Metal Trifluoromethanesulfonate Salts	Simple metal trifluoromethanesulfonate · Alkali metal	S102743	Sodium trifluoromethanesulfonate	2926-30-9	≥98%	NaOTf, neutral hydrophilic salt	Electrolyte, ionic-liquid raw material, component in phase-transfer systems, and ionic strength modifier
E Simple Metal Trifluoromethanesulfonate Salts	Simple metal trifluoromethanesulfonate · Alkali metal	P101098	Potassium trifluoromethanesulfonate	2926-27-4	≥98%	KOTf, readily soluble in polar solvents	Non-coordinating anion salt used in organic synthesis; additive in nucleophilic reactions and rearrangements
E Simple Metal Trifluoromethanesulfonate Salts	Simple metal trifluoromethanesulfonate · Lithium salt	L398970	Lithium trifluoromethanesulfonate	33454-82-9	≥99.5%	High-purity LiOTf with non-coordinating OTf⁻	Additive for lithium battery electrolytes; electrolyte for organic electrolysis and electrocatalytic reactions
E Simple Metal Trifluoromethanesulfonate Salts	Simple metal trifluoromethanesulfonate · Copper(I)	T589085	Copper(I) trifluoromethanesulfonate	42152-44-3	≥98%	CuOTf, Cu(I)–OTf Lewis acid	Copper catalyst for Ullmann / Chan–Lam couplings, alkyne additions, and arylation / amination reactions
E Simple Metal Trifluoromethanesulfonate Salts	Simple metal trifluoromethanesulfonate · Strong Lewis acid	A475120	Aluminum trifluoromethanesulfonate	74974-61-1	≥99.9% metals basis	Al(OTf)₃, high-purity strong Lewis acid	Catalyst for Friedel–Crafts and alkylation / acylation reactions; also used as electrolyte and dopant in materials
F Neat Trifluoromethanesulfonic Acid and Functionalization Reagents	Neat trifluoromethanesulfonic acid · Deuterated	T340898	Trifluoromethanesulfonic acid-d	66178-41-4	≥98 atom% D, ≥98%	TfOD, D-labeled trifluoromethanesulfonic acid	NMR / kinetic and mechanistic studies, isotopic tracing, and preparation of D-labeled substrates / reagents
F Trifluoromethanesulfonate Functionalization Reagents	Methyl trifluoromethanesulfonate · Deuterated methylating reagent	M474158	d₃-Methyl trifluoromethanesulfonate	73900-07-9	≥98 atom% D, ≥98%	CD₃OTf, strong electrophilic methylating reagent bearing a CD₃ group	Introduction of CD₃ groups via methylation; isotopic labeling in drug and metabolism studies
F Trifluoromethanesulfonate Functionalization Reagents	Methyl trifluoromethanesulfonate · ¹³C methylating reagent	M471805	¹³C-Methyl trifluoromethanesulfonate	207556-12-5	≥98 atom% ¹³C	¹³CH₃OTf, ¹³C-labeled methyl trifluoromethanesulfonate	¹³C-labeled methylation for metabolic pathway studies, mechanistic investigations, and NMR analysis
F Trifluoromethanesulfonate Functionalization Reagents	Silyl trifluoromethanesulfonate · TMSOTf	T398981	Trimethylsilyl trifluoromethanesulfonate (TMSOTf)	27607-77-8	≥99%	Classical Me₃SiOTf, strong Lewis acid / electrophilic silyl reagent	Carbonyl activation, carbohydrate chemistry, acylation / ring-closing condensations, and installation / removal of silyl protecting groups
F Trifluoromethanesulfonate Functionalization Reagents	Boron-based Lewis acid trifluoromethanesulfonate	D572389	Dibutylboron trifluoromethanesulfonate	60669-69-4	1 mol/L in diethyl ether	Bu₂BOTf solution, strong Lewis acid	Formation of enol boronates, stereoselective aldol / related alcohol-forming reactions, and carbonyl activation in organic synthesis

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