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Application Protocols
No assay-specific protocols (e.g., WB, IHC, IF, FC) apply to this small-molecule ligand. For catalytic use, consider the following generalized workflow (literature/general for BrettPhos-class ligands; adapt to your system):
In situ catalyst formation (typical):
Charge oven-dried vessel with Pd source (e.g., Pd2(dba)3), AdCyBrettPhos, and solvent.
Degas and backfill with N2/Ar; warm to reaction temperature for 5–15 min.
Add base and coupling partners (electrophile and nucleophile); maintain inert atmosphere.
Heat at target temperature until complete by LC/HPLC/GC.
Precatalyst approach:
Use a Buchwald-type precatalyst matched to this ligand (if available in your lab) to minimize induction periods; charge at 0.5–2 mol% Pd equivalents.
Workup (general):
Quench with water; extract into organic solvent; filter through silica/celite to remove Pd/ligand; purify by chromatography or crystallization.
These steps are general guidance for research use. For scale-up or regulated environments, implement formal DoE, in-process controls, and validated cleaning procedures.
Biological Roles
AdCyBrettPhos is a synthetic organophosphine ligand used in homogeneous catalysis and has no inherent biological role.
Not a metabolite, cofactor, or enzyme substrate. No known participation in cellular signaling or metabolic pathways (general statement for synthetic phosphine ligands).
Not intended for in vitro diagnostics or in vivo applications. For research use only.
If a bioconjugation or late-stage functionalization workflow uses this ligand’s catalytic system to modify biomolecules (e.g., arylation of complex substrates), the ligand acts solely as a component of the catalytic mixture and does not impart biological function itself.
For any biosafety considerations in a bioorganic laboratory, treat the ligand as a standard organic reagent: prevent exposure, avoid contamination of biological cultures, and dispose of waste following chemical (not biological) waste streams.
Buffer Applications
This product is a catalytic ligand and is not used to formulate aqueous buffers. No buffer capacity, pKa, or ionic properties are specified for this item.
If performing cross-couplings that tolerate water, the aqueous phase composition (e.g., carbonate/phosphate buffer) pertains to the reaction medium rather than this ligand. Choose buffers based on substrate solubility, base strength, and metal compatibility, not on properties of AdCyBrettPhos.
For precise aqueous compatibility or stability data for this SKU, refer to the CoA/Spec Sheet or evaluate empirically under your reaction conditions.
Green Alternatives
As a ligand, AdCyBrettPhos is not replaced by a solvent alternative; however, you can enhance process greenness via solvent/base choices and by benchmarking against ligands that enable milder, lower-loading conditions. The following comparisons are literature/general and not item-specific specifications.
Greener solvent choices for Pd couplings with BrettPhos-class ligands:
Prefer 2-MeTHF or CPME over THF/1,4-dioxane where feasible (biobased origin and improved EHS profile vs dioxane).
Use toluene/anisole over chlorinated solvents; consider isopropanol or t-BuOH for certain aminations.
Bases and energy efficiency:
Employ K3PO4, K2CO3, or Cs2CO3 in minimal excess; heterogeneous inorganic bases simplify workup and reduce aqueous waste.
Lower catalyst loading and shorter cycle times reduce metal waste; pre-activation can minimize induction periods.
Ligand benchmarking (contextual):
Within dialkylbiaryl phosphines, alternatives such as tBuBrettPhos, XPhos, SPhos, or BippyPhos may offer improved activity/selectivity for specific couplings, enabling lower temperatures or greener media. Trade-offs include substrate scope and cost.
Small comparison (general, illustrative):
1,4-Dioxane: high performance in many couplings; regulatory concerns.
2-MeTHF/CPME: greener, often comparable performance; different solubility profiles.
Toluene/anisole: non-polar, thermally robust; may require higher temps but simplify solvent recovery.
Select conditions that balance safety, regulatory drivers, and performance for your substrate class.
Pharmaceutical Uses
AdCyBrettPhos is a research-grade ligand for Pd-catalyzed cross-couplings used during discovery and process-development chemistry. It is not an excipient or API and has no clinical use.
Typical roles in pharmaceutical R&D/manufacture (general):
Enabling transformations: Facilitates C–N, C–O, and C–C couplings to construct drug-like scaffolds, including hindered biaryls and aryl amines.
Route scouting and telescoping: High-activity ligands can reduce steps, enable milder conditions, or expand substrate scope.
Late-stage diversification: Useful for rapidly generating analog libraries via amination/arylation of complex intermediates.
Compliance and documentation:
For GMP or scale-up contexts, ensure ligand identity/purity, residual metals in intermediates, and leachables are controlled. The ligand itself is typically removed during workup/purification.
Review SDS and CoA for specifications relevant to regulated environments.
No pharmacopeial monograph is associated with this ligand. Use is restricted to laboratory research and process development; not for human or veterinary use.
Physical Properties
Item-specific physical constants:
Appearance: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Weight: Not specified for this item; refer to CoA/Spec Sheet.
Melting point (MP): Not specified for this item; refer to CoA/Spec Sheet.
Boiling point (BP): Not applicable; organophosphine ligands typically decompose before boiling under ambient pressure (general statement).
Density: Not specified for this item; refer to CoA/Spec Sheet.
Refractive index: Not specified for this item; refer to CoA/Spec Sheet.
Solubility: Not specified for this item; refer to CoA/Spec Sheet.
Literature/general expectations for dialkylbiaryl phosphine ligands (non-spec):
Physical state: Usually crystalline solids or viscous oils depending on substituents.
Solubility profile: Good solubility in aromatic and ethereal solvents (e.g., toluene, xylene, dioxane, THF, CPME); limited solubility in aliphatic hydrocarbons; insoluble in water.
Stability: Air/moisture sensitivity varies; many BrettPhos-class ligands are reasonably air-stable as solids but slowly oxidize to phosphine oxides; solutions are more prone to oxidation.
Partitioning: Strongly lipophilic due to multiple aryl/alkyl groups (high logP expected; literature/general, not item-specific).
Note: For any certificate-controlled specifications (e.g., purity, residual solvents, metals), see the item’s CoA/Spec Sheet. Do not treat the above literature notes as specifications.
Quality and Grades
Item-specific grade/purity: Not specified for this item; refer to CoA/Spec Sheet.
Context and expectations for ligands used in catalysis (general guidance):
Catalysis-grade organophosphines are typically supplied with high assay and low inorganic/metal contaminants to avoid catalyst poisoning. Residual solvent content and identity of any stabilizer (if present) may be reported on the CoA.
Chromatographic purity vs assay: HPLC/GC purity indicates organic cleanliness; assay by qNMR can provide absolute content. For ligands, traces of phosphine oxide can impact activity; review impurity profile on CoA.
Water and peroxide levels: Typically reported when relevant to sensitive transformations. If not listed, verify by KF or peroxide tests as needed for critical applications.
Stabilizers: Some air-sensitive phosphines are packaged under inert gas or with oxygen scavengers. Presence/absence of stabilizers should be confirmed on the CoA; these can influence solution stability and reactivity.
Recommended incoming QC (user side, as appropriate):
Record appearance and mass; confirm identity by 31P NMR where feasible (sharp singlet for free phosphine; distinct shift for oxide). Assess organic purity by HPLC/GC and check for phosphine oxide.
For high-stakes couplings, prepare a small test reaction to benchmark performance against literature conditions.
For exact acceptance criteria for this SKU, consult the Aladdin CoA/Spec Sheet.
Reaction and Applications
AdCyBrettPhos (a BrettPhos-family dialkylbiaryl phosphine) is engineered for demanding Pd-catalyzed cross-couplings. While item-specific performance data are not provided, literature on related BrettPhos/AdCy variants supports the following application domains (general guidance):
C–N bond formation (Buchwald–Hartwig amination):
Effective for aryl chlorides, bromides, and sulfonates with primary/secondary amines, anilines, and hindered amines.
Bulky, strongly donating P-ligand fosters monoligated Pd species that accelerate oxidative addition and reductive elimination.
C–O bond formation:
Coupling of aryl halides/sulfonates with alcohols and phenols. Sterically demanding ligands can enable challenging aryl chlorides and hindered substrates.
Suzuki–Miyaura C–C coupling:
Active with challenging electrophiles (e.g., aryl chlorides) and certain sterically encumbered partners; the ligand’s steric bulk can improve transmetalation/reductive elimination kinetics.
Specialized substrates:
Electron-rich aryl chlorides, heteroaryl halides, and hindered biaryl formations are typical targets for BrettPhos-class ligands.
Practical tips (general):
Use 1–3 mol% Pd with 2–4 equiv ligand per Pd for in situ catalyst formation; precise ratios depend on Pd source and substrate class.
Degas solvent and employ dry base (e.g., K3PO4, NaOtBu, Cs2CO3). Water content can depress rates in some C–N couplings.
Pre-activation: Brief pre-stirring of Pd source with ligand at reaction temperature often shortens induction periods and enhances reproducibility.
Note: Optimize ligand:Pd ratio, base, and solvent per substrate; consult primary literature for Ad/Cy-BrettPhos variants when planning new transformations.
Reaction Conditions
Guidance below reflects literature/general practices for BrettPhos-class ligands and is not item-specific. Adjust to your substrate’s needs.
Ligand ratio: 2–4 equiv relative to Pd for in situ formation; precatalysts embed the correct stoichiometry.
Bases (choose by coupling type):
C–N (amines): NaOtBu, KOtBu, Cs2CO3, K3PO4.
C–O (alcohols/phenols): NaOtBu, KOtBu, Cs2CO3.
Suzuki–Miyaura: K3PO4, K2CO3, Cs2CO3, sometimes aqueous Na2CO3.
Solvents and temperatures:
Amination: 1,4-dioxane, toluene, CPME, 2-MeTHF, t-BuOH; 60–120 °C (substrate-dependent).
Aryl ether formation: Toluene/anisole/dioxane; 80–130 °C.
Suzuki–Miyaura: 1,4-dioxane/H2O or toluene/H2O, CPME/H2O; 50–110 °C.
Practical tips:
Pre-activation: Heat Pd source + ligand (and, if compatible, base) for 5–30 min to form active LPd species.
Degassing: Sparge with N2/Ar; dry solvents/bases minimize induction periods.
Concentrations: 0.05–0.5 M in electrophile typical; higher concentration can improve throughput but may increase byproducts.
Performance expectations:
Many challenging aryl chlorides and hindered aminations/etherifications become feasible; yields vary widely by substrate. Run small screens varying base/solvent/temperature to locate optima.
Safety and Handling
Item-specific hazard data:
Signal Word: Not specified for this item; refer to SDS.
H-Statements: Not specified for this item; refer to SDS.
GHS Classification/Pictograms: Not specified for this item; refer to SDS.
General safety considerations for dialkylbiaryl phosphine ligands (literature/general):
Irritation/Sensitization: May cause skin/eye irritation; avoid inhalation of dust. Handle in a chemical fume hood.
Oxidation risk: Phosphines can oxidize to phosphine oxides upon air exposure, particularly in solution. Minimize air/heat/light; use inert atmosphere when preparing solutions.
Combustibility: Organic solids; keep away from ignition sources. Use non-sparking tools for powders.
Incompatibilities: Strong oxidizers (peroxides, nitric acid), halogenating agents. Avoid prolonged contact with air and moisture.
PPE and engineering controls:
PPE: Lab coat, safety glasses, nitrile gloves (change regularly). For weighing, consider double-gloving; for larger quantities, use splash goggles.
Controls: Work in a fume hood; inert-gas manifold or glovebox recommended for solution handling or long operations.
First-aid overview (consult SDS for details):
Skin/eye contact: Rinse with water for at least 15 minutes; remove contaminated clothing; seek medical attention if irritation persists.
Inhalation: Move to fresh air; seek medical attention if symptoms occur.
Ingestion: Rinse mouth; do not induce vomiting; seek medical advice.
Always consult the product-specific SDS before use. For research use only.
Solvent Selection
AdCyBrettPhos is used as a ligand and is not itself employed as a bulk reaction solvent. Nonetheless, its performance depends on solvent choices for the Pd-catalyzed coupling.
General solvent compatibility (literature/general for BrettPhos-class ligands):
Aromatic ethers/aromatics: 1,4-dioxane, anisole, toluene, xylene — often excellent for C–N and C–O couplings; good solubility of ligand and substrates.
Green(er) ethers: CPME, 2-MeTHF — offer improved sustainability vs THF/1,4-dioxane and often maintain activity.
Polar aprotics: DMAc, NMP, DMF — enhance solubility of polar substrates/bases; consider removal challenges and safety profiles.
Alcoholic media: t-BuOH, i-PrOH — suitable for some aminations/etherifications; can facilitate base solubilization; watch for ligand solubility.
Water/co-solvent systems: Possible for Suzuki–Miyaura with aqueous base when substrates are sufficiently lipophilic to remain in the organic phase.
Practical notes:
Ensure the ligand and the pre-catalyst (e.g., Pd2(dba)3 or Pd(OAc)2) are dissolved or well dispersed before addition of base/substrates; partial pre-formation of LPd complexes can improve reproducibility.
For high-T couplings, high-boiling solvents (xylene, anisole) or sealed-vessel operations are advantageous.
Avoid strongly oxidizing media and air-saturated solvents to minimize phosphine oxidation; degas solvents by sparging or freeze–pump–thaw where appropriate.
Quick comparison (general):
Toluene/xylene: robust at elevated T; low polarity.
1,4-Dioxane: commonly effective; regulatory scrutiny in some contexts.
CPME/2-MeTHF: greener options; good balance of polarity and stability.
Storage and Reconstitution
Item-specific storage from Product Data:
Storage Conditions: Room temperature.
Shipped In: Not specified for this item; refer to CoA/Spec Sheet.
Appearance: Not specified for this item; refer to CoA/Spec Sheet.
General storage guidance for phosphine ligands (literature/general):
Store in tightly closed, moisture- and air-limited containers. If available, keep under inert gas (N2/Ar) and protect from light to slow oxidation to phosphine oxide.
For long-term storage, consider secondary containment with desiccant; minimize headspace oxygen.
Avoid proximity to oxidizers. Maintain organized segregation from acids and strong oxidants.
Solution handling:
If preparing stock solutions (e.g., in toluene, THF, CPME), use anhydrous, degassed solvent and inert atmosphere. Transfer with gas-tight syringes or cannula.
Store solutions in amber, crimp-sealed vials under inert gas at room temperature or refrigerated as appropriate; use within days to weeks depending on observed stability. Discard if 31P NMR indicates significant oxidation.
Reconstitution:
Not applicable (solid ligand). If caked or partially oxidized, do not attempt chemical reduction unless validated; obtain fresh material for critical applications.
Refer to the product’s CoA and SDS for any item-specific stability, shelf-life, and packaging details.
Structure and Identity
Brief: AdCyBrettPhos is a bulky dialkylbiaryl phosphine ligand of the BrettPhos family, designed for high-activity Pd-catalyzed cross-couplings.
Item-specific identifiers (from Product Data):
Product Name: AdCyBrettPhos
CAS: 2197989-24-3
CID: 155896888
InChIKey: 9147 (as provided)
SMILES: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Formula: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Weight: Not specified for this item; refer to CoA/Spec Sheet.
Structural features (general, literature-based for the BrettPhos class):
Core motif: Biphenyl (biaryl) backbone bearing an ortho-substituted dialkylphosphino group.
Phosphine substituents: Mixed bulky alkyl groups; by nomenclature, “Ad” denotes adamantyl and “Cy” denotes cyclohexyl substituents on P in this ligand family, creating a highly encumbered, strongly donating P(III) center (literature/general for Ad/Cy-BrettPhos variants).
Steric profile: Large cone angle and proximal aryl substitution enforce a monoligated (LPd) state that accelerates oxidative addition to aryl chlorides and stabilizes key catalytic intermediates (literature/general for dialkylbiarylphosphines).
Electronic tuning: Electron-rich P(III) increases electron density on Pd, lowering barriers for oxidative addition and facilitating reductive elimination in C–N/C–O couplings (literature/general).
2D structure description (general):
A biphenyl scaffold with an ortho-phosphino group on the lower ring; the phosphorus bears two bulky alkyl groups (adamantyl and cyclohexyl by naming convention), and the upper aryl ring typically contains substituents that help shape the catalytic pocket (literature/general for BrettPhos-type ligands).
Synthetic Utility
Functional group: trivalent phosphine (PIII) bound to a biaryl backbone with bulky alkyl substituents (Ad and Cy by naming convention). This architecture defines the ligand’s reactivity profile with Pd.
Key roles (literature/general for BrettPhos-type ligands):
Monoligation at Pd(0/II): Steric bulk promotes LPd species that undergo fast oxidative addition to aryl chlorides and favor reductive elimination in C–N/C–O couplings.
Chemoselectivity control: Electron-rich environment can enable couplings at aryl chloride in the presence of less reactive sites, and can suppress β-hydride elimination in certain cases.
Hindered substrates: Effective with ortho-substituted aryl halides, secondary amines, and sterically congested alcohols/phenols.
Named transformations enabled:
Buchwald–Hartwig amination (arylamine formation from aryl halides/sulfonates).
Ullmann-type alternatives (Pd-catalyzed) for C–O bond formation with phenols/alcohols.
Suzuki–Miyaura couplings under challenging electrophilic conditions.
Retrosynthetic value:
Access to libraries of anilines, diaryl ethers, and biaryls by choosing coupling partners late in a route.
Practical implementation:
Combine with common Pd sources (Pd2(dba)3, Pd(OAc)2, precatalysts). Use ligand:Pd of ~2:1 to 4:1 depending on substrate and Pd source. Pre-activation (heating ligand + Pd in solvent/base) often improves turnover.
These points are general to the ligand class; optimize for each substrate set.
Target Specificity
Not applicable. This product is a small-molecule ligand for transition-metal catalysis and has no antigen/epitope or biological target attributes.
No clone, isotype, or species reactivity data apply.
For substrate specificity in catalysis, see Reaction & Applications and Synthetic Utility sections.
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