Grewe diamine

Greige processing Grewe diamine Grey Flannel Grey mold Grey oxide Grey scale... 

In the second general method, the amine (16), known as Grewe diamine, is the paradigm intermediate onto which the thia2o1ium ring is constmcted. Differences occur only in the raw materials and methods used for the manufacture of the diamine. The same end of the linear sequence is universally practiced by all large manufacturers. 

In a much different approach based on cyanamide, acrylonitrile, and acetonitrile, cyanoacetamidine [56563-07-6] (32) is cyanoethylated and the condensation product [56563-10-1] (33) is dehydrogenated and hydrogenated direcdy to Grewe diamine in the presence of Raney cobalt and ammonia (56). 

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