Reaction of aminocarbene complexes of chromium with alkynes. 1. Formation and rearrangement of ketene and nitrogen ylide complexes

The title reactions of chromium-containing carbene complexes (CO) 5 Cr=(R 1 )N(R 2 R 3 ) (R 1 =H, Me, Ph; R 2 =Me; R 3 =Me, C 3 H 5 , CH 2 C 3 H 5 ; R 2 R 3 =(CH 2 ) 5 ) 8 and (CO) 5 Cr=C[(CH 2 ) 3 C≡CPh]N(R 1 R 2 ) (R 1 =R 2 =Me; R 1 R 2 =(CH 2 ) 5