STUDIES ON THE REACTIONS OF (ETA-5-CYCLOPENTADIENYL)DICARBONYLCOBALT WITH PHENYL-1-NAPHTHYLACETYLENE AND WITH PHENYL-2-NAPHTHYLACETYLENE, AND AN X-RAY CRYSTALLOGRAPHIC DETERMINATION OF ONE OF THE PRODUCTS - (ETA-5-CYCLOPENTADIENYL)-[ETA-4-1,3-DI-(1-NAPHTHYL)-2,4-DIPHENYLCYCLOBUTADIENE]COBALTP
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abstract
The reactions of (5-C5H5)Co(CO)2 with both phenyl-1-naphthylacetylene and phenyl-2-naphthylacetylene have been shown to produce all four possible 5-cyclobutadiene-cobalt complexes and all six possible 4-cyclopentadienone-cobalt derivatives. The structures of the 4-cyclobutadiene-cobalt complexes have been assigned on the basis of proton NMR and mass spectral studies, and unequivocally established by means of an X-ray diffraction investigation for one of the isomers as (5-cyclopentadienyl)[4-1,3-di(1-naphthyl)-2,4-diphenylcyclobutadiene]cobalt. This compound is triclinic, a = 10.88(2), b = 15.710(6), c = 8.728(4) , = 95.09(4), = 101.94(2), = 86.93(3). The space group is P1 with Z = 2. The structure was solved by Patterson and Fourier methods and refined by full-matrix least squares methods (4128 reflections above 3) to a final R = 0.036. Bond distances and angles are normal but the cyclobutadiene ring is not quite planar. One of the atoms is 0.047 out of the plane of the other three apparently to relieve steric stress. The two phenyl rings are almost coplanar with the cyclobutadiene ring (torsion angles 3.9 and 20.4) while the naphthyl rings are almost perpendicular to it (torsion angles 63.8, 64). 1979.
