n-butyllithium; 1,1,1,3,3,3-hexamethyl-disilazane 1.) THF, n-hexane, -10 deg C, 10 min; 2.) THF, -70 deg C, 1 h; 3.) THF, -5 to 20 deg C, 5 min; Multistep reaction;

lithium hexamethyldisilazane in tetrahydrofuran T=-68°C;

n-butyllithium; 1,1,1,3,3,3-hexamethyl-disilazane 1.) THF, n-hexane, -10 deg C, 10 min; 2.) THF, -70 deg C, 1 h; 3.) THF, -5 to 20 deg C, 5 min; Multistep reaction;