nBuLi in hexane N2 atmosphere, addn. of soln. nBuLi, to soln. of silyl compound at 0°C, stirring (room temp., 14 h), reflux (2 h), addn. of soln. of diazaborolidine at -30°C, stirring (room temp., 14 h); removement of insoluble material under N2 atmosphere, removement of volatiles (reduced pressure), distillation at 40°C (1E-2 Torr), isolation of byproduct by sublimation at 100°C (1E-3 Torr); elem. anal.;

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