A metal-free radical cascade cyclization of 2-isocyanoaryl thioethers with alcohols has been developed. It provides a novel and effective method to synthesize diverse 2-hydroxyalkyl benzothiazoles with broad substrate scope, good functional group tolerance and moderate to excellent yields.
Modified gelatin types and hydrophilic elements containing them
申请人:AGFA-GEVAERT
naamloze vennootschap
公开号:EP0614930A1
公开(公告)日:1994-09-14
New types of modified gelatins are disclosed, modified at part of the free carboxyl groups of the polypeptide chain, by the introduction of a new end-standing amino, sulphinic acid or thiol group. The modified gelatins show an enhanced reactivity towards vinylsulphonyl hardeners. The invention further includes hardened modified gelatin types and hydrophilic elements containing them. In particular, a differentially hardened multilayer element, preferably a photographic element, is disclosed.