First intramolecular alkyne–CO insertion reactions in aminocarbene complexes of chromium: formation of condensed heterocycles following extensive hydrogen migrations
Abstract
The aminocarbene complexes (CO)5CrC(Me)[N(Me)(CH2)3CCPh](6) and (CO)5CrC[graphic omitted][(CH2)3CCMe](14) lead, upon heating in benzene, to the polycyclic triple bond and CO inserted products C15H15NO (12) and C12H15NO (19) through multiple C–H activations.