321-54-0

Basic information

• Product Name: COUMAPHOS-OXON
• Synonyms: phosphoricacid,diethylester,esterwith3-chloro-7-hydroxy-4-methylcoumari;3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl diethyl phosphate;COUMARIN,3-CHLORO-7-HYDROXY-4-METHYL-,DIETHYLPHOSPHATE;Coralox;Phosphoric acid (3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl)diethyl ester;Phosphoric acid 3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl diethyl;Phosphoric acid 3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yldiethyl ester;(3-chloro-4-methyl-2-oxo-chromen-7-yl) diethyl phosphate
• CAS NO: 321-54-0
• Molecular Formula: C₁₄H₁₆ClO₆P
• Molecular Weight: 346.7
• EINECS: 206-288-6
• Mol File: 321-54-0.mol
• Article Data: 2

Chemical Properties

• Boiling Point: 226.5°C
• Flash Point: 347°C
• Appearance: /
• Density: 1.36g/cm³
• Vapor Pressure: 1.01E-07mmHg at 25°C
• Refractive Index: 1.542
• CAS DataBase Reference: COUMAPHOS-OXON(CAS DataBase Reference)
• NIST Chemistry Reference: COUMAPHOS-OXON(321-54-0)
• EPA Substance Registry System: COUMAPHOS-OXON(321-54-0)

Safety Data

• RIDADR: 2783
• HazardClass: 6.1(a)
• PackingGroup: II
• Hazardous Substances Data: 321-54-0(Hazardous Substances Data)

Usage

Safety Profile

Deadly poison by ingestion. When heated to decomposition it emits very toxic fumes of POx and Cl-. See also ESTERS and PHOSPHATES.

InChI:InChI=1/C14H16ClO6P/c1-4-18-22(17,19-5-2)21-10-6-7-11-9(3)13(15)14(16)20-12(11)8-10/h6-8H,4-5H2,1-3H3

Upstream product

• 6174-86-3 3-chloro-4-methylumbelliferone 
• 814-49-3 diethyl chlorophosphate 
• 56-72-4 coumaphos 

Relevant articles and documents

Diethyl phosphite production from phosphorothioate degradation with molybdenum peroxides and hydrogen peroxide in ethanol

A polystyrene-supported molybdate-peroxide polymer (Mo-Y(s)) destroys phosphorothioate pesticides of the form (ArO)P(=S)(OEt)2 in EtOH under mild oxidative (H2O2) conditions and produces a commodity organophosphate. This is the first report of a metal-based system that successfully degrades the “live” pesticides parathion, diazinon and coumaphos. In addition to the operational advantages of heterogeneous reaction chemistry, the Mo-Y(s) support degrades multiple equivalents of the pesticide in H2O2(aq). Of particular importance is the predominant production of diethyl phosphite, a commodity chemical, from diazinon degradation over Mo-Y(s) in EtOH; no toxic oxon is found. Coumaphos and parathion produce the corresponding oxon which have ΔH? (kcal/mol) of 15.4 (0.5) and 21.7 (0.8), respectively; these activation parameters are consistent with key observations found in the relative amount of coumoxon and paraoxon produced. Finally, a discrete molybdate-peroxide complex is presented as a possible solution model for this heterogeneous reaction.