Additionsreaktion von 3‐Dimethylamino‐2,2‐dimethyl‐2 H ‐azirin mit Phenylisothiocyanat

Reaction of 3‐Dimethylamino‐2,2‐dimethyl‐2 H ‐azirine with Phenyl Isothiocyanate In contrast to the reactions of 3‐dimethylamino‐2,2‐dimethyl‐2 H ‐azirine ( 1a ) with various isothiocyanates, leading to thiazoline derivatives, the reaction of 1a with phenyl isothiocyanate at room temperature gives 5,5‐dimethyl‐3‐phenyl‐Δ 1 ‐imidazolin‐4‐dimethyliminium‐2‐thiolate ( 9 , Scheme 2 ). The structure of 9 is deduced from spectral data and reactions of this zwitterionic compound ( Schemes 2 and 4 ).