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. 31, 1985
Filed:
Oct. 25, 1982
Robert M Parkhurst, Redwood City, CA (US);
Ronald S Pardini, Reno, NV (US);
Chemex Pharmaceuticals, Inc., Denver, CO (US);
Abstract
A process for producing novel compositions including optically active molecules of nordihydroguaiaretic acid (d,1-2,3-dimethyl,1,4-bis(3,4-dihydroxyphenyl)butane) and intermediates, starting with 1,4-bis(3,4-dimethoxyphenyl)butanone, or other structurally similar composition having oxy substituents at the 3,4-phenyl positions, comprising (1) forming the corresponding butanol; (20) forming the corresponding 1,4-butane ether or siloxy composition; (3) cleaving the oxy substituent from the butane chain at the 1 and 4 positions; (4) dealkylating the phenols at the 3,4 positions to leave hydroxy substituents with hydrobromic acid reflux for 8 to 10 hours. Optical orientation is preserved throughout.