Preparation of dialkyl- and diarylphosphonoalkanoic acids and substituted acrylic acids
US4307232A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1980 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Mar 21, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4006
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for preparing the substituted phosphonoalkanoic acid of the formula ##STR1## wherein: R.sup.1 is alkyl of 1-8 carbon atoms, aralkyl of 7-10 carbon atoms, phenyl, or substituted phenyl of 6-10 carbon atoms; PA1 R.sup.2 is H, hydrocarbyl of 1-18 carbon atoms, or substituted hydrocarbyl of 1-18 carbon atoms, wherein in said hydrocarbyl groups the carbon atom attached to the ##STR2## moiety is substituted with two or three hydrogen atoms or is a carbon atom of an aromatic ring; and PA1 Y is oxygen or sulfur, which process comprises contacting and reacting, at a temperature of about -70.degree. C. to about 125.degree. C., a pressure of about 1-100 atmospheres (0.1-10 MPa), and for a time sufficient to effect reaction, the phosphite ester of the formula ##STR3## wherein R.sup.1 and Y are as defined above, with the .alpha.-halocarboxylic acid of the formula R.sup.2 CHXCO.sub.2 H, wherein X is Cl, Br, or I and R.sup.2 is as defined above, in the presence of at least two moles of base per mole of limiting reagent, said base having a pKa greater than about 15, to produce the substituted phosphonoalkanoic acid, and process for preparing the substituted acrylic acid of the formula R.su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.