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. 05, 1980
Filed:
Mar. 15, 1979
Applicant:
Inventor:
Kurt D Kaufman, Kalamazoo, MI (US);
Assignee:
Thomas C. Elder, Inc., Hamilton, IN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
26034321 ; 26034344 ;
Abstract
.alpha.-Loweralkylfurocoumarins are produced by forming a .beta.-haloalk-2-enyl, e.g., .beta.-haloallyl, ether of a hydroxycoumarin having an active hydrogen in the position ortho to the hydroxy group, and heating the formed ether, preferably in dimethylaniline or like basic amine solvent. An abnormal Claisen rearrangement produces a novel o-hydroxy-(.beta.-haloalk-2-enyl) coumarin intermediate which can be dehydrohalogenated directly without isolation to the desired .alpha.-loweralkylfurocoumarin, e.g., .alpha.-methylfurocoumarin.