Photolysis of BzCr(CO)_3 and TpMn(CO)_3 in the presence of H_3B·NEt_3 yields a metal-borane σ complex. Displacement of the weakly coordinated borane by P(OEt)_3 proceeds by a dissociative mechanism and an Eyring analysis yields the first estimate of 20 kcal mol-1 for the strength of this novel interaction.
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