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:
Jun. 01, 1982
Filed:
May. 22, 1981
Applicant:
Inventor:
Petrus A Kramer, Amsterdam, NL;
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549302 ;
Abstract
The novel dihalomethylenelactone of formula (I) can be prepared by the trihalomethylation of an anhydride of formula (II). Reaction of compound (II), wherein R.sub.1 =R.sub.2 =methyl, with CBr.sub.3 COONa in DMF gave at -25.degree. C. the dibromovinyllactone and with CCL.sub.3 COONa in DMF at 0.degree. C. the dichlorovinyllactone. ##STR1## X.sub.1, X.sub.2 and X.sub.3 are halogen atoms and R.sub.1 and/or R.sub.2 are hydrogen atoms and/or alkyl groups with 1-10 carbon atoms;