Abstract
The conformations of alkylcobalt tricarbonyl tertiary phosphine complexes, ROC(O)CH2Co(CO)3L (L = PPh3; R = Me, Et, n-Pr, i-Pr, s-Bu, t-Bu, c-Hex (two modifications), CH2Ph, (S)-{[EtOC(O)]CH(Me)}, (1S,2R,5S)-menthyl, (1R,2S,5R)-menthyl; L = P(1S,2S,5R-menthyl)Ph2, R = i-Pr), have been studied in crystalline phases by single-crystal X-ray diffraction. The geometries of the complexes are of a trigonal-bipyramidal type with the non-carbonyl ligands in the two axial positions. We find that the (chiral) conformations of the alkyl ligand and the phosphine group develop concertedly.
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