Patents by Inventor Toshiko Nishijima

Toshiko Nishijima 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).

  • Process for isomerization of a cyclopropanecarboxylic acid
    Patent number: 4008268
    Abstract: A process for isomerizing 2-(.beta.,.beta.-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylic acid represented by the formula, ##STR1## which comprises heating the acid of the formula (I) in the presence of the anhydride of the acid or a reagent producing the acid anhydride in the reaction system.The ester resulting from 2-(.beta.,.beta.-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylic acid and, for example, 3-phenoxybenzyl alcohol is a compound which has a very wide range of insecticidal spectrum and has a very high controlling effect as a low-toxicity insecticide not only for domestic use and public health but also against insects injurious to agriculture or forestry, and in the case of the 3-phenoxybenzyl ester or 5-benzyl-3-furylmethyl ester of the 2-(.beta.,.beta.-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylic acid, the trans-isomer is lower than the cis-isomer in toxicity to warm-blooded animals.
    Type: Grant
    Filed: June 10, 1975
    Date of Patent: February 15, 1977
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Toshio Mizutani, Nobushige Itaya, Toshiko Nishijima, Osamu Magara