The 1 :I complex between an osmate ester and bovine serum albumin was found to be effective as a n enantioselective catalyst in the cis-hydroxylation of alkenes, affording diols in up t o 68% e.e. and turnover of the catalyst with t-butyl hydroperoxide.

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The IR spectrum of a Nujol mull of (1) suggests that N2 elimination is followed initially by stabilization of the L3Co fragment such as in (3), because the v(CoH) band grows at the expense of the v(NN) band, and then by formation of L~C O . L -J 131 v(NN) = 2064 cm-I v(CoH) = 1830 crn-'(br)