# US 4,375,557 A · Process for the preparation of dihalovinylcyclopropane carboxylic acid

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,375,557 A
- Document ID: US4375557A
- Status: Granted
- Kind: A
- Application number: 06/385,991
- Filed: 1982-06-07
- Granted: 1983-03-01
- Earliest claimed: 1980-10-22
- Assignees: Shell Oil Company
- Inventors: Petrus A. Kramer
- Web page: https://patentgrep.com/patent/US4375557A

## CPC

- C07D 307/93: condensed with a ring other than six-membered
- C07C 51/00: Preparation of carboxylic acids or their salts, halides or anhydrides (of acids by hydrolysis of oils, fats or waxes C11C)
- C07C 51/09: from carboxylic acid esters or lactones
- C07C 62/02: Saturated compounds containing hydroxy or O-metal groups
- C07C 62/18: Saturated compounds containing keto groups
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

Novel compounds of the formula I ##STR1## in which each of Y.sup.1 and Y.sup.2 independently represents a fluorine, chlorine or bromine atom and each of R.sup.1 and R.sup.2 independently represents a hydrogen atom or an alkyl group having up to 10 carbon atoms, or R.sup.1 and R.sup.2 together represent an alkylene group having from 2 to 5 carbon atoms, may be converted by the action of base into the corresponding dihalovinylcyclopropane carboxylic acids.

## Claims

### Claim 1

A process for the preparation of a (cis)-dihalovinylcyclopropanecarboxylic acid of the formula: ##STR10## wherein each of Y.sup.1 and Y.sup.2 independently represents a fluorine, chlorine or bromine atom and each of R.sup.1 and R.sup.2 independently represents a hydrogen atom or an alkyl group having up to 10 carbon atoms, or R.sup.1 and R.sup.2 together represent an alkylene group having from 2 to 5 carbon atoms which comprises treating a compound of the formula ##STR11## wherein Y.sup.1, Y.sup.2, R.sup.1 and R.sup.2 have the above stated meanings, with a base.

### Claim 2 (depends on 1)

A process according to claim 1, wherein the base is an alkali metal hydroxide, hydride or alkoxide.

### Claim 3 (depends on 2)

A process according to claim 2 wherein the base is an alkali metal hydroxide.

### Claim 4 (depends on 3)

A process according to claim 3 wherein the base is sodium hydroxide.