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. 13, 1976
Filed:
May. 11, 1975
Applicant:
Inventors:
David Rees Parry, Wokingham, EN;
Alfred Glyn Williams, Basingstoke, EN;
Assignee:
Imperial Chemical Industries Limited, London, EN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ; 2602 / ;
Abstract
Process for the preparation of a compound of formula: ##STR1## WHEREIN N IS ZERO OR AN INTEGER FROM 1 TO 12 AND R.sup.1 and R.sup.2 are hydrogen or lower alkyl, which comprises the step of treating a mixture of a diketene of formula: ##STR2## and a strongly acidic medium selected from the group consisting of concentrated sulphuric acid and oleum with a compound of formula: