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:
May. 01, 2001
Filed:
Mar. 16, 1992
Applicant:
Inventor:
Teh-Kuei Chen, Gaylordsville, CT (US);
Assignee:
Nestec S.A., Vevey, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
Alkyl pyrazine compounds are prepared by heating and refluxing an aqueous mixture of an ammonium-containing compound and at least one acyloin compound. Reaction product may be isolated from the reacted mixture by adjusting the pH of the reacted mixture, separating solid material from the pH-adjusted reacted mixture, adding water to the separated solid material to form a solution, allowing product to crystallyze from the solution and then collecting the crystalline product. Alternatively, the reactants may be heated, refluxed and sublimed to collect the pyrazine reaction product on a cooled sublimation collection surface.