Diethyl phosphite - ≥99% , CAS No.762-04-9

CAS: 762-04-9 Cat. No.: D109100 Molecular Weight: 138.1 Beilstein Registry Number: 605759 EC Number: 212-091-6
AVAILABLE TO ORDER
GRADE & PURITY ≥99%
Synonyms
D0521 | DIETHYLPHOSPHONO GROUP | Diethyl acid phosphite | O,O-Dimethyl S-ethyl-2-sulfonylethyl phosphorothiolate | OPH(OC2H5)2 | O,O-Diethyl phosphonate | U9X9YBA22W | BRN 0605759 | Diethyl phosphonate | diethoxyphosphino-1-one | SCHEMBL35436 | NSC2665 |
Storage
Room temperature,Argon charged
Shipped In
Normal
Size
USA
Germany (EU)*
Price
Qty
25ml
D109100-25ml
3 In stock
$15.90
100ml
D109100-100ml
2 In stock
$21.90
500ml
D109100-500ml
In stock ≥10
$62.90
Enter a quantity for the sizes you want to add.
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Why this grade

≥99% for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

🌡

Storage & shipping

Room temperature,Argon charged Ships Normal Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 39 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
D0521 | DIETHYLPHOSPHONO GROUP | Diethyl acid phosphite | O, O-Dimethyl S-ethyl-2-sulfonylethyl phosphorothiolate | OPH(OC2H5)2 | O, O-Diethyl phosphonate | U9X9YBA22W | BRN 0605759 | Diethyl phosphonate | diethoxyphosphino-1-one | SCHEMBL35436 | NSC2665 |
Specifications & Purity
≥99%
Storage
Room temperature, Argon charged
Shipped In
Normal
Purity
≥99%
Names and Identifiers
Pubchem Sid504764060
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/504764060
Canonical SmilesCCO[P+](=O)OCC
IUPAC Namediethoxy(oxo)phosphanium
InChIKeyLXCYSACZTOKNNS-UHFFFAOYSA-N
INCHI1S/C4H10O3P/c1-3-6-8(5)7-4-2/h3-4H2,1-2H3/q+1
Isomeric SMILES CCO[P+](=O)OCC
WGK Germany 1
RTECS TG7875000
UN Number 1993
Packing Group I
Molecular Weight 138.1
Beilstein 605759
Reaxy-Rn 6383103
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=6383103&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

Download SDS →

✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

Look up COA →

📊 Datasheet

Quick-reference summary of product specifications and applications.

View datasheet →

🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

View spec sheet →

Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassOrganic oxygen compounds
ClassOrganooxygen compounds
SubclassNot available
Intermediate Tree Nodes Not available
Direct ParentOrganooxygen compounds
Alternative Parents Organic oxides  Hydrocarbon derivatives  Organic cations  
Molecular FrameworkAliphatic acyclic compounds
Substituents Organic oxide - Hydrocarbon derivative - Organooxygen compound - Organic cation - Aliphatic acyclic compound
DescriptionThis compound belongs to the class of organic compounds known as organooxygen compounds. These are organic compounds containing a bond between a carbon atom and an oxygen atom.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

24 results found

Lot NumberCertificate TypeDateItem
E2620230Certificate of AnalysisMay 12, 2026 D109100
E2620227Certificate of AnalysisMay 12, 2026 D109100
E2620228Certificate of AnalysisMay 12, 2026 D109100
E2620229Certificate of AnalysisMay 12, 2026 D109100
F2223044Certificate of AnalysisApr 02, 2026 D109100
B2625079Certificate of AnalysisFeb 27, 2026 D109100
F2123126Certificate of AnalysisApr 08, 2025 D109100
E2509224Certificate of AnalysisJul 10, 2024 D109100
E2509364Certificate of AnalysisJul 10, 2024 D109100
L2216806Certificate of AnalysisJan 05, 2023 D109100
A1904153Certificate of AnalysisNov 15, 2022 D109100
K2519058Certificate of AnalysisJun 15, 2022 D109100
K2520069Certificate of AnalysisJun 15, 2022 D109100
L2524169Certificate of AnalysisJun 15, 2022 D109100
K2506051Certificate of AnalysisJun 15, 2022 D109100
J2430197Certificate of AnalysisJun 15, 2022 D109100
G2328053Certificate of AnalysisJun 15, 2022 D109100
F2510128Certificate of AnalysisJun 15, 2022 D109100
F2223047Certificate of AnalysisJun 15, 2022 D109100
F2223046Certificate of AnalysisJun 15, 2022 D109100
E2306018Certificate of AnalysisJun 15, 2022 D109100
D2529021Certificate of AnalysisJun 15, 2022 D109100
D2313834Certificate of AnalysisJun 15, 2022 D109100
B2603100Certificate of AnalysisJun 15, 2022 D109100

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Chemical and Physical Properties
SolubilityHydrolyzes with water.
SensitivityMoisture sensitive.
Refractive Index1.4101
Flash Point(°F)179.6 °F
Flash Point(°C)82℃
Boil Point(°C)50-51 °C/2 mmHg
Melt Point(°C)-70°C
Molecular Weight137.090 g/mol
XLogP30.700
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count3
Rotatable Bond Count4
Exact Mass137.037 Da
Monoisotopic Mass137.037 Da
Topological Polar Surface Area35.500 Ų
Heavy Atom Count8
Formal Charge1
Complexity65.700
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count1
Documents & Articles
Citations of This Product
References
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19. Sheng Wang, Songqi Ma, Chenxiang Xu, Yuan Liu, Jinyue Dai, Zongbao Wang, Xiaoqing Liu, Jing Chen, Xiaobin Shen, Jingjing Wei, Jin Zhu.  (2017)  Vanillin-Derived High-Performance Flame Retardant Epoxy Resins: Facile Synthesis and Properties.  MACROMOLECULES,      [PMID:] [10.1021/acs.macromol.7b00097]
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36. Jiaqi Wang, Lei Chen, Yin Lu, Kan Zhang.  (2025)  Design and Synthesis of Diethyl Phosphite Functionalized Oxazine Ring Substituted Bio-Benzoxazine Resins with Enhanced Thermal Stability and Flame Retardancy via Hydrophosphonylation Strategy.  ACS Sustainable Chemistry & Engineering,      [PMID:] [10.1021/acssuschemeng.5c10195]
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