S‐Alkylation en série hétérocyclique par catalyse par transfert de phase: thioalkyl‐2‐thiazoles, thioalkyl‐2‐Δ‐4‐thiazolines et thioalkyl‐2‐benzothiazoles

S‐Alkylation in heterocyclic serie by phase transfer catalysis: 2‐alkylthiothiazoles, 2‐alkylthio‐Δ‐4‐thiazolines and 2‐alkylthiobenzothiazoles Some Δ‐4‐thiazoline‐, thiazolidine‐, and benzothiazoline‐2‐thiones have been S‐alkylated by phase transfer catalysis; yields averaged 80 to 90%. With halogenated heterocyclic compounds of poor reactivity, the main reaction consisted in a dequaternization of the catalyst by the thiones acting as nucleophiles.