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:
Dec. 28, 1993
Filed:
Oct. 21, 1992
Applicant:
Inventors:
Aleksander Warm, Visperterminen, CH;
David Laffan, Visp, CH;
Assignee:
Lonza Ltd., Gampel/Valais, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
560138 ; 568766 ; 560144 ; 549365 ;
Abstract
A process for the production of substituted vinylbenzenes of the general formula: ##STR1## wherein R is a lower alkyl group having 1 to 4 C atoms, R.sub.1 is hydrogen or an acetyl group and R.sub.2 is hydrogen, a lower alkyl group having 1 to 4 C atoms or a benzyl group. A trialkylhydroquinone is cyclized with an aldehyde to an acetal and the latter is pyrolized to the endproduct. The substituted vinylbenzenes are valuable intermediate products in the synthesis of antioxidants.