Bidentate alkene aminocarbene complexes of chromium: alkyne insertion with ring expansion versus alkyne insertion with cyclopropanation: formation and crystal structure of a dihydroazepinechromium tricarbonyl complex

Article abstract of DOI:10.1016/0022-328X(90)80112-D

Whereas (CO)4Cr=C(H)N(CH3)(ν²-CH2CH=CH2) (3) reacts with diphenylacetylene to give the expected azabicyclo<4.1.0>heptene complex (6), (CO)4Cr=C(CH3)N(CH2CH=CH2)(ν²-NCH2CH=CH2) (12) and (CO)4Cr=C(CH3)N(CH2Ph)(ν²-CH2CH=CH2)