MANUFACTURE OF 2,2-DIMETHYL-3(BERA, BETA-DICHLOROVINYL)-CYCLOPROPANE-1-CARBOXYLIC ACID ESTER, 4,4-DIMETHYL-5-HALOGEN-T-ALKOXY-TETRAHYDROPYRONE AND MANUFACTURE

Title:

MANUFACTURE OF 2,2-DIMETHYL-3(BERA, BETA-DICHLOROVINYL)-CYCLOPROPANE-1-CARBOXYLIC ACID ESTER, 4,4-DIMETHYL-5-HALOGEN-T-ALKOXY-TETRAHYDROPYRONE AND MANUFACTURE

Document Type and Number:

Japanese Patent JPS6178752

Kind Code:

A

Abstract:

Disclosed is a process for preparing cis-trans isomer mixtures of 2,2-dimethyl-3( beta , beta -dichlorovinyl)-cyclopropane-1-carboxylic acid esters, having a high cis/trans isomer ratio, wherein a 4,4-dimethyl-5-halogen-6-alkoxytetrahydro-pyrone or a 3,3-dimethyl-4-halogen-5-oxo-pentanic acid ester is reacted with dichlorophosphonic acid esters in the presence of alkali alcoholates or alkali hydrides or lithium alkyls. Also disclosed are novel starting tetrahydropyrone compounds usable in the above process, and a process for preparation of the novel compounds which includes reacting beta , beta -dimethyl- gamma , delta -dihalogen- delta -valerolactones with alkali alcoholates at reaction temperatures between -10 DEG and +50 DEG C.

Inventors:

HANSU GEORUKU SHIYUMITSUTO

Application Number:

JP20855885A

Publication Date:

April 22, 1986

Filing Date:

September 20, 1985

Export Citation:

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Assignee:

DYNAMIT NOBEL AG

International Classes:

C07C69/743; C07D309/30; (IPC1-7): C07B61/00; C07C67/00; C07C67/333; C07C69/743; C07D309/30

Attorney, Agent or Firm:

Toshio Yano

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