A Stable N-Heterocyclic Silylene with a 1,1 '-Ferrocenediyl Backbone

摘要

The N-heterocyclic silylene [{Fe(eta(5)-C5H4-NDipp)(2)}Si] (1DippSi, Dipp=2,6-diisopropylphenyl) shows an excellent combination of pronounced thermal stability and high reactivity towards small molecules. It reacts readily with CO2 and N2O, respectively affording (1DippSiO(2))(2)C and (1DippSiO)(2) as follow-up products of the silanone 1DippSiO. Its reactions with H2O, NH3, and FcPH(2) (Fc=ferrocenyl) furnish the respective oxidative addition products 1DippSi(H)X (X=OH, NH2, PHFc). Its reaction with H3BNH3 unexpectedly results in B-H, instead of N-H, bond activation, affording 1DippSi(H)(BH2NH3). DFT results suggest that dramatically different mechanisms are operative for these H-X insertions.