COBALT METALLOCYCLES. XIII. PREPARATION AND X-RAY CRYSTALLOGRAPHY OF COBALTACYCLOPENTADIENE AND DINUCLEAR COBALT COMPLEXES

Article abstract of DOI:10.1016/0022-328X(84)80469-6

(η-Cyclopentadienyl)(triphenylphosphine)cobaltacyclopentadienes having an electron withdrawing substituent on the cyclopentadienyl ring, (1b: R = COOMe; 1c: R = COMe), were prepared in reasonable yields by treatment of a solution of (η-C5H4R)(PPh3)2Co with acetylene.A non-substituted cyclopentadienyl analog (1a: R = H) was also isolated in low yield according to a similar procedure.Novel dinuclear complexes were also formed as by-products and the structure of (2b: R = COOMe), having a μ₂,η³-benzyl moiety, was determined by an X-ray crystallographic analysis.The X-ray analyses of 1a and 1b were also carried out.Crystals of 1a are monoclinic, space group Pa, a 8.529(3), b 16.010(6), c 8.028(4) Angstroem, β 100.31(3) deg, Z = 2; crystals of 1b are monoclinic, space group P2₁/a, a 8,327(2), b 36.468(7), c 8.021(1) Angstroem, β 98.75(2) deg, Z = 4; and crystals of 2b are monoclinic, space group P2₁/c, a 10.681(2), b 30.722(7), c 8.912(1) Angstroem, β 93.55(1) deg, Z = 4.They have been refined to R = 0.034, 0.047 and 0.050, respectively.