5- Mercaptothiazolium hydroxide inner

Mercaptothiazolium hydroxide inner salts (2) (X = S) are prepared from 5-hydroxy-oxazolium inner salts and CS (2, 25). The oxazolium inner salts may advantageously be replaced with their precursors, which are N-arylacylalanins (Scheme 23). 

Maionic add, in monomethine thiazolo-cyanine synthesis, 52 4-Mercaptoimidazolium hydroxide inner salts, from 5-hydroxy THISs, 11 from 5-mercaptothiazolium salts, 12 2-Mercaptoselenazoles. substituted in 4-positions, photographic emulsion, 237... 

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