Abstract
Reaction of N-arylethylenimines with carbon dioxide in the presence of tetraethylammonium bromide gives N-aryl-2-oxazolidones, with N,N′-diarylpiperazines as by-products. Carbon disulfide reacts with N-arylethylenimines under similar conditions to give 1∶1 copolymers, together with small amounts of N-arylthiazolidine-2-thiones. Carbon oxysulfide gives copolymers only. The copolymers are converted at 250° C into N-arylthiazolidine-2-thiones and N-arylthiazolidones, respectively. N-Arylethylenimines react with phenyl isothiocyanates to give 2-phenylimino-3-arylthiazolidines.
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