| Popis: |
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 SiN cleavage, nucleophilic substitution of halogen took place and the products were 1-acetyl-2,2,6,6-tetramethyldisilamorpholine and N , N -bismethoxymethyldimethylsilyl)acetamide respectively. These compounds were shown by IR and 1 H NMR spectra to have the N,N -disilylacetamide structure. Thermodynamic, kinetic constants of hindered rotation around the CN bond in these compounds were determined from their temperature-variable 1 H NMR spectra. The main products of thermolysis of the silylamides are α,ω-dichloropolydimethylsiloxanes and polydimethylcyclosiloxanes. |
