1: With pyridine; water; 1,1,1,3,3,3-hexamethyl-disilazane; toluene-4-sulfonic acid in water T=110°C; P=1034.32 Torr; 20 - 24 h; Sealed vessel; 2: With sodium hydroxide in water pH=9; 3: With acetic acid in water pH=4; Product distribution / selectivity;