Na in benzene-d6 byproducts: tBu3SiNa, (tBu3Si)2, tBu3SiD; 40°C, 3 d;

in n-heptane byproducts: (t-Bu)3SiH; under dry Ar or N2, 90 °C for 7 h; volatiles were removed in vac., residue was taken in heptane, soln. was filtered, concd., crystn. at -23 °C, elem. anal.;