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:
Mar. 17, 1987
Filed:
Dec. 03, 1985
Applicant:
Inventor:
Stanley B Mirviss, Stamford, CT (US);
Assignee:
Stauffer Chemical Company, Westport, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548308 ; 548311 ; 548312 ; 548313 ; 548314 ;
Abstract
Unsaturated hydantoins are reduced to the corresponding saturated hydantoin by carrying out the hydrogenation reaction using a nickel catalyst in the presence of more than a stoichiometric amount of caustic. Use of this process allows for almost complete hydrogenation in short reaction times and also allows the reaction to be done using aqueous solvents and low levels of catalyst. Frothing or foaming of the hydrogenation reaction mixture at elevated concentrations of hydantoin is overcome by incremental addition of hydantoin to the hydrogenation reaction mixture.