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:
May. 17, 1977
Filed:
Jan. 07, 1976
Kazimiera J Paciorek, Corona del Mar, CA (US);
Reinhold H Kratzer, Costa Mesa, CA (US);
Dennis W Karle, Mission Viejo, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
Bis-benzoins of the formula ##STR1## wherein R is meta-phenylene or para-phenylene are prepared by first conting aldehydes of the formula ##STR2## with sodium bisulfite to form bisulfite addition products of the formula ##STR3## THEN CONTACTING THE BISULFITE ADDITION PRODUCTS WITH EITHER POTASSIUM CYANIDE OR SODIUM CYANIDE TO FORM CYANOHYDRINS OF THE FORMULA ##STR4## and finally contacting the cyanohydrins with benzaldehyde to form the bis-benzoins. The bis-benzoins can be oxidized to form the corresponding bis-benzils which are useful as starting materials for producing phenylated polyquinoxalines which in turn are useful as coatings for fibers, graphite precursors, films and laminating materials.