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:
Aug. 29, 1978
Filed:
Feb. 23, 1977
Jean-Pierre Decor, Thurins, FR;
Rhone-Poulenc Industries, Paris, FR;
Abstract
Acetal sulphones useful as intermediates in the preparation of vitamin A and other terpene compounds are made by reacting a sulphone of the formula: ##STR1## with an .omega.-halogeno-acetal of an ethylenically unsaturated aldehyde of the formula: ##STR2## in which m and n each represent zero or 1 and are such that m+n=1, R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, which may be identical or different, represent hydrogen or straight or branched alkyl radical of 1 to 6 carbon atoms, R.sub.6 represents straight or branched alkyl of 1 to 6 carbon atoms, R represents straight or branched alkyl of 1 to 6 carbon atoms or arylalkyl containing a straight or branched alkyl of from 1 to 6 carbon atoms or aryl, unsubstituted or substituted by alkyl, alkoxy, alkylthio, alkoxycarbonyl, hydroxyl or halogen, and R' represents hydrogen or, if m is zero, straight or branched alkyl of 1 to 6 carbon atoms.