Abstract
The reaction of NaCo(CO) 4 with trans-1-bromppenta-2,4-diene in tetrahydrofuran at −78°C affords ( syn-η 3-2,4-pentadienyl)Co(CO) 3 ( 1) in moderate yield. Addition of triphenylphosphine to 1 in ether at 0°C gives ( syn-η 3-2,4-pentadienyl)Co(CO) 2[P(C 6H 5) 3] ( 2a). In solution, 2a equilibrates with its anti isomer ( 2b) at room temperature. The crystal structure of 2a has been determined by X-ray diffraction analysis. Compound 2a crystallizes in the triclinic space group P 1 with lattice parameters: a 10.326(2), b 10.763(4), c 11.452(2) Å, α 105.99(2), β 100.10(1), γ 108.05(2)°; V 1114.98 Å 3, Mol. wt. 539.69, D (calcd.) 1.324 g/cm 3 and Z = 2. The structure was solved and refined to R and R w values of 0.0357 and 0.0408, respectively for 4046 reflections.
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