THE FACILE ISOMERIZATION OF BENZO(8,9)BICYCLO(5.2.0)NONA-2,4,8-TRIENE TO BENZO(7,8)BICYCLO(4.2.1)NONA-2,4,7-TRIENE PROMOTED BY L3M(CO)3 COMPLEXES (M=Cr, Mo, W). THE CRYSTAL STRUCTURE OF THE TRICARBONYL COMPLEX OF BENZO(7,8)BICYCLO(4.2.1)NONA-2,4,7-TRIENE

Article abstract of DOI:10.1016/0022-328X(86)80007-9

Benzo(8,9)bicyclo(5.2.0)nona-2,4,8-triene (I) isomerizes to benzo(7,8)bicyclo(4.2.1)nona-2,4,7-triene (II) in the presence of L3M(CO)3 complexes (L=CO, NH3, CH3CN; M=Cr, MO, W).In THF at 40 deg C with (CH3CN)3CrCO3 the uncomplexed II is formed together with smaller amounts of the corresponding η⁶-tricarbonylchromium complex, TCC-II.In n-butyl ethwer at 120 deg C with (NH3)3Cr(CO)3 the main product is the latter complex.The structure of TCC-II has been determined by NMR and X-ray analysis.