The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1976
Filed:
Dec. 19, 1973
Masuo Murakami, Tokyo, JA;
Kozo Takahashi, Tokyo, JA;
Ichiro Isaka, Hoya, JA;
Teruaki Ozasa, Ageo, JA;
Teruya Kashiwagi, Urawa, JA;
Yamanouchi Pharmaceutical Co., Ltd., Tokyo, JA;
Abstract
A process for the preparation of cephalosporanic acid derivatives represented by the formula ##SPC1## Wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a univalent group other than a hydrogen atom, said R.sub.1 and R.sub.2 may be combined to form a divalent group and A represents a divalent group represented by the formulae ##SPC2## Wherein R.sub.3 represents a hydrogen atom or a group which does not contribute to the reaction, which comprises heating a penicillin sulfoxide derivative represented by the formula ##SPC3## Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above. The cephalosporanic acid derivatives prepared by the process of this invention are useful as a starting material for the preparation of antibacterials.