Patents by Inventor Kohichi Aketa

Kohichi Aketa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for preparing 4-hydroxy-3-methyl-2-(2-propynyl)-2-cyclopentenolone
    Patent number: 4343953
    Abstract: 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.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: August 10, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Noritada Matsuo, Nobushige Itaya, Kohichi Aketa, Osamu Magara, Toshio Nishioka
  • Process for preparing optically active .alpha.-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)isovalerate
    Patent number: 4312816
    Abstract: 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.
    Type: Grant
    Filed: July 7, 1978
    Date of Patent: January 26, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kohichi Aketa, Yukio Suzuki, Nobuo Ohno, Isamu Nakayama, Takashi Kato
  • Method for preparing a mixture of stereoisomers of .alpha.-cyano-3-phenoxybenzyl 2-(4-substituted-phenyl)isovalerates
    Patent number: 4307036
    Abstract: 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.
    Type: Grant
    Filed: April 11, 1980
    Date of Patent: December 22, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yukio Suzuki, Kohichi Aketa, Masachika Hirano
  • Process for preparing optically active .alpha.-cyano-3-(4-halogenophenoxy)-benzyl 2-(4-chlorophenyl)isovalerate
    Patent number: 4293504
    Abstract: 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.
    Type: Grant
    Filed: February 5, 1980
    Date of Patent: October 6, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yukio Suzuki, Kiyoshi Kasamatsu, Kohichi Aketa
  • Mixture of stereoisomers of .alpha.-cyano-3-(4-halogenophenoxy)benzyl 2-(4-chlorophenyl)isovalerate, a process for producing the same, and a composition containing the same
    Patent number: 4279924
    Abstract: 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.
    Type: Grant
    Filed: February 6, 1980
    Date of Patent: July 21, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yukio Suzuki, Kiyoshi Kasamatsu, Kohichi Aketa
  • Method for preparing a mixture of stereoisomers of .alpha.-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)isovalerate
    Patent number: 4238406
    Abstract: 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.
    Type: Grant
    Filed: January 29, 1979
    Date of Patent: December 9, 1980
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yukio Suzuki, Kohichi Aketa, Masachika Hirano