hydrogenchloride; chloro-trimethyl-silane; 1,1,1,3,3,3-hexamethyl-disilazane 1.) acetonitrile, reflux, 4 h, 2.) methanol, 10 min; Yield given. Multistep reaction;

1: 1.) hexamethyldisilazane, trimethylchlorosilane, 2.) conc. HCl / 1.) acetonitrile, reflux, 4 h, 2.) methanol, 10 min 2: oxalyl chloride, DMF / 2 h / 0 °C 3: 4-(dimethylamino)pyridine / a) 0 deg C 30 min, b) RT, 30 min View Scheme