Reactivity of Phosphasilametallacyclopropane toward Substrates with Polarized E−H Bonds (E = O, N, S, and P):  Formation and Structures of Ring-Opening Products

Treatment of a three-membered metallacycle Cp*(CO)Fe{κ²(Si,P)-SiMe₂PPh₂} (1) with substrates of the type R_nEH (ER_n = OH, OMe, O^tBu, OPh, S^pTol, NEt₂, NPhH, PPh₂, and PPhH) results in the instantaneous formation of the ring-opening products Cp*(CO)Fe(PPh₂H)(SiMe₂ER_n). In these reactions, 1,2-addition of the substrates occurs exclusively across the silicon−phosphorus bond in 1. The structures of the products have been unequivocally determined by spectroscopic data and X-ray diffraction analysis.