hydrogen in benzene-d6 High Pressure; NMR tube charged with (C5Me5)2ScNHCH2CMe3 and C6D6, cooled to 77 K, t-BuCN condensed in, 700 torr of H2 introduced, sealed, reacted at 25°C and 4 atm of H2 for 17 h, heated to 80°C for further 24 h; not isolated; detected by NMR;