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. 09, 2000
Filed:
Dec. 28, 1998
Takashi Fukumoto, Kitakanbara-gun, JP;
Rensuke Ikarashi, Kitakanbara-gun, JP;
Kuraray Co., Ltd., Kurashiki, JP;
Abstract
A process for producing 2-azabicyclo[2.2.1]hept-5-en-3-one is provided by reacting a sulfonyl cyanide represented by the general formula R-SO.sub.2 CN (in which R represents an alkyl group or a phenyl group which may have a substituent), in the presence of water and in a hydrocarbon solvent at a pH of 4 to 7 inclusive. 2-Azabicyclo[2.2.1]hept-5-en-3-one can be produced in a high yield and a high purity in one step process, with a reduced amount of solvent used, safely and with good productivity. A method of crystallizing 2-azabicyclo[2.2.1]hept-5-en-3-one is also provided, which includes dissolving 2-azabicyclo[2.2.1]hept-5-en-3-one into an organic solvent mainly including at least one of diisopropyl ether and methyl tertiary butyl ether, cooling the solution to deposit crystals of 2-azabicyclo[2.2.1]hept-5-en-3-one. Finely divided particulate crystals of 2-azabicyclo[2.2.1]hept-5-en-3-one excellent in fluidity and handleability can be obtained with a simple procedure and in a high recovery rate.