ChemInform Abstract: EINIGE DERIVATE VON 3‐FORMYL‐PROPIONSAEUREAMIDEN UND IHR TAUTOMERIEVERHALTEN

Abstract

Durch Reaktion des Acetalesters (I) mit geeigneten Aminen bei erhöhter Temperatur werden die Acetalamide (II) dargestellt.

Intramolecular Reversible Addition Reactions to the C=O Group

“…Analogous reactions were observed in solutions of 5hydroxy-5-phenylthiazolidine-2-thione (236B, R I = Ph, R2 = H) and 6hydroxy-4,4,6-trimethyl-l,3-thiazine-2-thione (238B) [689,690]. The products of the covalent hydration of 3-acyl-5-phenyl-l,4,5thiadiazolium salts are cyclic 3-acyl-2-hydroxy-5-phenyl-l,4,5-thiadiazolines (239) [691,692]. The anion (240) has the open structure, and N -acyl-N'thiobenzoylhydrazines (241) have been isolated by acidification of alkaline solutions.…”

“…The anion (240) has the open structure, and N -acyl-N'thiobenzoylhydrazines (241) have been isolated by acidification of alkaline solutions. Reactions of compounds (239) with diazomethane gave S-methylderivatives of open structure while with diazoethane a mixture of S-and O-derivatives was formed.…”