Abstract N, N-Bis (halomethyldimethydimethylsilyl) acetamides, MeCON (SiMe 2 CH 2 X) 2,(X= Cl, Br) were prepared by transsilylation of N, O-bis (trimethylsilyl) acetamide with halomethyldimethylchlorosilane. With water and methanol, instead of the expected Si N cleavage, nucleophilic substitution of halogen took place and the products were 1-acetyl-2, 2, 6, 6-tetramethyldisilamorpholine and N, N-bismethoxymethyldimethylsilyl) acetamide ...