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1809-19-4 Usage

Chemical Properties

clear colorless to slightly yellow liquid


Dibutyl phosphite was used as anti-wear agent in bio-based lubricating oil.

General Description

Dibutyl phosphite undergoes addition reaction with Schiff bases to yield 1,4-bis[N-methyl(dibutoxyphosphonyl)-1-(2-furyl)]diaminobenzene and 4,4′-bis[N-methyl(dibutoxyphosponyl)-1-phenyl]benzidine. It is antiwear and extreme-pressure additive in industrial gear oils.

Flammability and Explosibility


Check Digit Verification of cas no

The CAS Registry Mumber 1809-19-4 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, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 1809-19:
84 % 10 = 4
So 1809-19-4 is a valid CAS Registry Number.

1809-19-4 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • TCI America

  • (D0300)  Dibutyl Phosphite  >95.0%(GC)

  • 1809-19-4

  • 25g

  • 290.00CNY

  • Detail
  • Aldrich

  • (125938)  Dibutylphosphite  96%

  • 1809-19-4

  • 125938-100ML

  • 475.02CNY

  • Detail
  • Aldrich

  • (125938)  Dibutylphosphite  96%

  • 1809-19-4

  • 125938-500ML

  • 1,248.39CNY

  • Detail



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

Version: 1.0

Creation Date: Aug 11, 2017

Revision Date: Aug 11, 2017


1.1 GHS Product identifier

Product name Dibutyl phosphite

1.2 Other means of identification

Product number -
Other names Dibutyl Phosphite

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:1809-19-4 SDS

1809-19-4Relevant articles and documents

Trialkyl Phosphite Addition to the Bis(benzene)-iron(II) and -ruthenium(II) Dications: Catalysed Hydrolysis to Dialkyl Phosphites

Sweigart, Dwight A.

, p. 1159 - 1160 (1980)

Phosphite addition to 2+ (M = Fe,Ru) yields cyclohexadienyl phosphonium and phosphonate adducts that catalyse the conversion of excess of phosphite into HP(O)(OR)2 and RP(O)(OR)2.

Synthesis and characterization of new symmetrical bisphosphonates

Marques Rodrigues, Janaina,DaCosta, Joao Batista Neves

, p. 137 - 149 (2002)

In order to search for new chelating agents, widely employed methodologies in the chemistry of organophosphorus compounds such as the Michaelis-Arbuzov and Michaelis-Becker reactions were used to synthesize new bisphosphonates in high yields. The importance of the synthesis of these compounds resides in their potential capability of complexing different metals, all the more so because bisphosphonates have been widely employed in the diagnosis and therapy of several bone diseases, such as osteoporosis and hypercalcemia, as extracting agents for alkaline, alkaline earth, and transition metals, and also as reaction catalysts. All bisphosphonates synthesized were characterized by IR, 1H-NMR, 13C-NMR, 31P-NMR, and mass spectroscopy.



Paragraph 0086; 0094, (2020/05/02)

PROBLEM TO BE SOLVED: To provide a method for producing an organophosphorus compound which has excellent energy efficiency without containing a halogenated alkyl or a by-product derived from a halogenated alkyl. SOLUTION: There is provided a method for producing an organophosphorus compound by reacting a trivalent organophosphorus compound represented by the following general formula (1) in the presence of a super strong acid and/or at least one acid catalyst containing a solid superstrong acid catalyst to generate a pentavalent organophosphorus compound represented by the following general formula. (where Z1 represents OR2 or R2; Z2 represents OR3 or R3; R1, R2 and R3 represent an alkyl group, an alkenyl group or the like; when R2 and R3 are an alkyl group or the like, R2 and R3 may be bonded to each other to form a cyclic structure; and R1 may be a hydrogen atom.) SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT

Synthesis of phosphonates in a continuous flow manner

Tóth, Nóra,Tajti, ádám,Ladányi-Pára, Katalin,Bálint, Erika,Keglevich, Gy?rgy

, p. 285 - 286 (2019/03/11)

The synthesis of dialkyl H-phosphonates and α-aminophosphonates was studied in a continuous flow microwave reactor. Depending on the conditions, the alcoholysis of dialkyl H-phosphonates could be fine-tuned towards the mixed and the fully transesterified products. The continuous flow synthesis of α-aryl-α-aminophosphonates was elaborated utilizing the aza-Pudovik reaction of imines and dialkyl H-phosphonates, as well as the by the Kabachnik-Fields condensation of primary amines, benzaldehyde and > P(O)H reagents.

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