ChemInform Abstract: Reactivity of N-Disubstituted Aminocarbene Complexes of Chromium: Nitrogen to Carbon Migration of the Benzyl and Allyl Groups Following Alkyne Insertions

Chromium aminocarbene complexes (CO) 5 CrC(CH 3 )N(CH 2 Ph)(CH 3 ) ( 3 ), (CO) 5 CrC(H)N(CH 2 Ph)(CH 3 ) ( 5 ) and (CO) 5 CrC(H)N(CH 2 CHCH 2 )(CH 3 ) ( 7 ) react with diphenylacetylene in boiling benzene to give, after insertions of the alkyne and CO and migration of the benzyl or the allyl group from nitrogen to carbon, substituted 2- and 3-pyrrolinones ( 10–15 ). The structures of (CO) 5 -CrC(CH 3 )N(CH 2 Ph)CH 3 ( 3 Z ) ( R 0.031 R w 0.030) and of the chromium tricarbonyl complex of the pyrrolinone 10 , (CO) 3 Cr (C 24 H 23 ON) ( 9 ) ( R 0.034 R w 0.035) were determined by the X-ray diffraction.