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1809-21-8 Usage


Dipropyl phosphite, with the molecular formula C6H15O3P, is a chemical compound that exists as a clear, colorless liquid with a slightly fruity odor. It is recognized for its flame retardant properties and is utilized in various applications across different industries.


Used in Plastics and Synthetic Fibers Industry:
Dipropyl phosphite is used as a flame retardant to enhance the fire resistance of plastics and synthetic fibers, making them safer for use in various applications.
Used in Polyurethane Production:
In the production of polyurethane, dipropyl phosphite serves as a processing aid, contributing to the efficiency and quality of the final product.
Used in PVC Production:
Dipropyl phosphite is used as a stabilizer in the production of PVC, ensuring the material's stability and performance during manufacturing processes.
Used in Chemical Synthesis:
Dipropyl phosphite also functions as a chemical intermediate in the synthesis of other organophosphorus compounds, playing a crucial role in the creation of a wide range of chemical products.
Safety Precautions:
It is important to handle dipropyl phosphite with care, as it can be irritating to the skin and eyes, and harmful if ingested or inhaled. Proper safety measures should be taken to minimize exposure and ensure the safe use of this compound.

Check Digit Verification of cas no

The CAS Registry Mumber 1809-21-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,0 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1809-21:
78 % 10 = 8
So 1809-21-8 is a valid CAS Registry Number.



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 14, 2017

Revision Date: Aug 14, 2017


1.1 GHS Product identifier


1.2 Other means of identification

Product number -
Other names di-n-Propylphosphite

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:1809-21-8 SDS

1809-21-8Relevant articles and documents

Fluorinated phosphorus compounds: Part 11. The reactions of some fluorinated amines with dialkyl and bis(fluoroalkyl) phosphorochloridates

Timperley, Christopher M.,Waters, Matthew

, p. 1144 - 1149 (2005)

Dimethyl phosphorochloridate reacted with RFCH 2NH2 in ether in the presence of Et3N to afford (MeO)2P(O)NHCH2RF, where RF = CF3 and C2F5, in 39 and 47% yield, respectively. Similar reactions with di-n-propyl and diisopropyl phosphorochloridates could be effected only with H2NCH 2CF3 when 4-dimethylaminopyridine catalyst was added and (n-PrO)2P(O)NHCH2CF3 and (i-PrO) 2P(O)NHCH2CF3 were isolated in 49 and 25% yield, respectively. Treatment of POCl3 with one molar equivalent each of H2NCH2CF3 and Et3N permitted the synthesis of Cl2P(O)NHCH2CF3 in 43% yield. Bis(fluoroalkyl) phosphorochloridates (RFO)2P(O)Cl, where RF = C2F5CH2, C3F 7CH2 and (CF3)2CH, reacted with 2,2,2-trifluoroethylamine and 2,2,3,3,3-pentafluoropropylamine to furnish phosphoramidates (RFO)2P(O)NHCH2R, where R = CF3 or C2F5, in yields of 32-67%.

Method for preparing phosphite diester by transesterification


Paragraph 0026, (2020/01/25)

The invention discloses a method for preparing phosphite diester by transesterification. Dimethyl phosphite and monohydric alcohol which are used as raw materials are stirred, reacted and rectified under the action of a basic catalyst to prepare the phosphite diester, so the problems of high deice requirements and large amount of acid-containing three wastes in the process of producing the phosphite diester by reacting phosphorus trichloride with alcohol are avoided. The method has the advantages of low raw material toxicity, simple process, mild reaction conditions, low device requirements, low pollution, high raw material conversion rate, high product selectivity, stable supply of the raw materials, provision of the phosphite diester used for fine chemical engineering or medical intermediates by dimethyl phosphite production enterprises, high added values of the product, and provision of a new way for the synthesis of the phosphite diester.

Electrophilic trifluoromethylation of S-hydrogen phosphorothioates

Santschi, Nico,Togni, Antonio

experimental part, p. 4189 - 4193 (2011/07/31)

A series of S-hydrogen phosphorothioates have been converted to the corresponding S-trifluoromethyl derivatives upon reaction with the electrophilic trifluoromethylation reagent 1 (trifluoromethyl 1,3-dihydro-3,3-dimethyl-1,2- benziodoxole). Relative rate data were obtained by 19F NMR monitoring of competition experiments and were evaluated by means of the Taft equation. A high positive polar sensitivity factor of 2.55 was found for electron-rich substrates and a negative one of -0.37 for electron-poor ones, implying the involvement of two different rate-determining steps. Furthermore, the reaction was found to be unaffected by steric factors.

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