FRIEDEL-CRAFTS CYNICHRODENOYLATION OF (CO)2(NO)CR(ETA-5-C5H4)CH2(ETA-5-C5H4)FE(ETA-5-C5H5) AND X-RAY STRUCTURES OF (CO)2(NO)CR(ETA-5-C5H4)CH2(ETA-5-C5H4)FE(ETA-5-C5H4)FE(ETA-5-C5H4)C(O)(ETA-5-C5H4)CR(CO)2(NO) AND (CO)2(NO)CR(ETA-5-C5H4)CH2(ETA-5-(2-C(O)-[(ETA-5-C5H4)CR(CO)2(NO)])C5H3)-FE(ETA-5-C5H5)

Friedel-Crafts cynichrodenoylation of [eta-5-(ferrocenylmethyl)cyclopentadienyl)]dicarbonylnitrosylchromium (hereafter called cynichrodenylferrocenylmethane (3) has afforded (1'-cynichrodenoylferrocenyl)cynichrodenylmethane (5), (3-cynichrodenoylferrocenyl)cynichrodenylmethane (6) and (2-cynichrodenoylferrocenyl)cynichrodenylmethane (7) in total yield. The reactivities and orientations of the three Cp rings on 3 towards the Friedel-Crafts reaction are discussed. X-ray diffraction studies of 5 and 7 are reported; crystallographic data for 5 are as follows, space group P2(1)/c, a 16.739(4), b 12.171(4), c 13.112(3) angstrom, beta = 106.84(2)-degrees, Z = 4; crystallographic data for 7 are as follows, space group P2(1)/n, a 8.226(3), b 24.78(1), c 12.742(6) angstrom, beta = 106.22(4)-degrees, and Z = 4. The cynichrodenylmethyl and cynichrodenoyl moieties of 5 are in the 1,3'-configuration. Compound 7 adopts a transoid conformation at the organic carbonyl carbon and the dihedral angle between the two planes of methylene substituted cyclopentadienyl rings is 89.0-degrees.