Promoting effect of calcium alkoxide on the protonation of Cp groups of Cp_2TiCl_2

摘要

The variable-temperature ~1H NMR spectra show that protonation of Cp and CpH liberation are more rapid and more extensive after addition of calcium (CaL_2) to Cp_2TiCl_2 in LH (LH: 2-methoxyethanol). The unstable CpTiIV intermediates can be easily reduced by Al to a stable CpTiIII moiety and isolated in the form of the [CpTi(μ,η2-L′)Cl]_2 compound (L′H: 1-methoxy-2-propanol).