Sagami Chemical Research Center

Yuriko Takahatake

Kiyoshi Kondo

Kiyohide Matsui

Akira Negishi

Daiei Tunemoto

Kiyosi Kondo

Kikuo Sugimoto

Novel syntheses of dihalovinylcyclopropanecarboxylates, including potent insecticides, are described. The processes begin with the reaction between an alkenol and an orthoester to produce a .gamma.-unsaturated carboxylate, followed by the catalyzed addition of a carbon tetrahalide to the double bond and dehydrohalogenation to produce a cyclopropane derivative.

Process for preparing dihalovinylcyclopropanecarboxylates

Bicyclolactone compounds represented by the formula (I) ##STR1## wherein R.sup.1 represents an alkyl group having 1 to 4 carbon atoms, R.sup.2 represents a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms and R.sup.3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms;

Precursors for prostaglandin analogue and process for preparing the same

A process for producing 3-cyanomethyl cyclopentanone derivatives which are useful precursors of fragrant components in jasmine and analogous thereof such as methyl jasmonoate, methyl dihydrojasmonate, etc., is disclosed. In the process, the jasmonoates are produced starting from .beta.-dicarbonyl compounds and azides through several-step reactions.

Process for producing 3-cyanomethyl cyclopentanone derivatives

An improved process for preparing a 6,6,6-trihalo-3,3-dimethyl-4-hexenoate, intermediate in the production of pyrethroid insecticides, comprises dehydrohalogenating with an organic amine a 4,6,6,6-tetrahalo-3,3-dimethylhexanoate having a 4-halogen atom of higher atomic number than any of the 6-halogen atoms.

Growing community of inventors

Tokyo, Japan

Yuriko Takahatake