Preparation of .alpha.-oxo-.alpha.-(3-alkoxycarbonyl-2,2-dimethyl-cycloprop-1-yl)-metha ne-phosphonic acid esters
US4489013A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1983 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Oct 7, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D333/46
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of an .alpha.-oxo-.alpha.-(3-alkoxycarbonyl-2,2-dimethyl-cycloprop-1-yl)-methane -phosphonic acid ester of the formula ##STR1## in which R is alkyl or a radical customary in the alcohol component of pyrethroids, and PA0 R.sup.1 is alkyl or phenyl, or the two radicals R.sup.1 together are alkanediyl, comprising reacting .beta.,.beta.-dimethyl-acrylic acid chloride of the formula ##STR2## with a phosphorous acid ester of the formula EQU R.sup.4 O--P(OR.sup.1).sub.2 in which PA0 R.sup.4 is alkyl, at a temperature between about 0.degree. and 100.degree. C., to produce the novel compound 1-oxo-3-methyl-2-butene-phosphonic acid of the formula ##STR3## which is then reacted with a sulphuranylidene-acetic acid ester of the formula ##STR4## in which R.sup.2 and R.sup.3 each independently is alkyl or together are alkanediyl, at a temperature between about 0.degree. and 100.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.