Patents by Inventor Takashi Hishida

Takashi Hishida 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).

  • Allenic esters, process for preparation thereof and process for rearrangement thereof
    Patent number: 3978100
    Abstract: Allenic esters of the formula: ##EQU1## (specific examples of R, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are given) and a process for the preparation thereof which comprises reacting propargyl alcohol derivatives with 2-substituted ortho-acetic acid esters in the presence of an acidic catalyst. These allenic esters are rearranged in the presence of an alkali catalyst to form .alpha., .beta., .gamma., .delta.-unsaturated carboxylic acid esters and are useful as intermediates in the synthesis of various perfumes, medicines, agricultural chemicals and the like.
    Type: Grant
    Filed: April 18, 1974
    Date of Patent: August 31, 1976
    Assignee: Kuraray Co., Ltd.
    Inventors: Yoshiji Fujita, Yoshiaki Omura, Takashi Hishida, Kazuo Itoi