in tetrahydrofuran byproducts: (CH3)2C3N2(CH(CH3)2)2; High Pressure; under N2, Schlenk techniques; addn. of Ge compd. and CH2C(Me)C(Me)CH2 toTHF, mixt. stirred at room temp. for 18 h, heated at 100°C for 3 d; NMR;