Sumitomo Chemical Company, Limited

Kohichi Aketa

Yukio Suzuki

Masachika Hirano

Kiyoshi Kasamatsu

Nobushige Itaya

Noritada Matsuo

Takashi Kato

Nobuo Ohno

Toshio Nishioka

Osamu Magara

Isamu Nakayama

The present invention relates to a novel method for producing cyclopentenolone of the formula (I), ##STR1## which is a useful intermediate for producing agricultural chemicals, which comprises reacting an acetonedicarboxylic ester of the formula (VII), ##STR2## wherein R is a C.sub.1 -C.sub.6 alkyl group, with 2-propynyl chloride in the presence of magnesium alkoxide and in the presence of alkali iodide to obtain novel mono-(2-propynyl)-substituted acetonedicarboxylic ester of the formula (VI), ##STR3## wherein R is as defined above; hydrolyzing the mono-(2-propynyl)-substituted acetonedicarboxylic ester of the formula (VI) under alkaline conditions with an alkali and then reacting the hydrolyzed product with methylglyoxal of the formula, ##STR4## to obtain novel .gamma.-diketone of the formula (V), ##STR5## and ring-closing the .gamma.-diketone of the formula (V) under alkaline condition.

Method for preparing 4-hydroxy-3-methyl-2-(2-propynyl)-2-cyclopentenolone

A process for isomerizing optically active .alpha.-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)isovalerate at the asymmetric carbon atom of the 3-phenoxybenzyl moiety, and a process for obtaining (S)-.alpha.-cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)isovalerate from (R, S)-.alpha.-cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)isovalerate.

Process for preparing optically active .alpha.-cyano-3-phenoxybenzyl

A method for preparing .alpha.-cyano-3-phenoxybenzyl 2-(4-substituted-phenyl)isovalerates which consist substantially of or are rich in the enantiomer pair (S)-.alpha.-cyano-3-phenoxybenzyl (S)-2-(4-substituted-phenyl)isovalerate and (R)-.alpha.-cyano-3-phenoxybenzyl (R)-2-(4-substituted-phenyl)isovalerate.

Method for preparing a mixture of stereoisomers of

An optically active .alpha.-cyano-3-(4-halogenophenoxy)-benzyl 2-(4-chlorophenyl)isovalerate, which consists substantially of or is rich in (S)-.alpha.-cyano-3-(4-halogenophenoxy)benzyl (S)-2-(4-chlorophenyl)isovalerate; a method for preparing the same; and an insecticidal and/or acaricidal composition containing the same.

Process for preparing optically active

A mixture of stereoisomers of an .alpha.-cyano-3-(4-halogenophenoxy)benzyl 2-(4-chlorophenyl)isovalerate, which consists substantially of or is rich in an enantiomer pair of an (S)-.alpha.-cyano-3-(4-halogenophenoxy)benzyl (S)-2-(4-chlorophenyl)isovalerate and an (R)-.alpha.-cyano-3-(4-halogenophenoxy)benzyl (R)-2-(4-chlorophenyl)isovalerate; a process for preparing the same; and an insecticidal and/or acaricidal composition containing the same.

Mixture of stereoisomers of .alpha.-cyano-3-(4-halogenophenoxy)benzyl

An .alpha.-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)isovalerate which consists substantially of or is rich in (S)-.alpha.-cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)isovalerate and (R)-.alpha.-cyano-3-phenoxybenzyl (R)-2-(4-chlorophenyl)isovalerate. A method for preparing the same and an insecticidal and acaricidal composition.

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Toyonaka, Japan

Kohichi Aketa