Hydrosilylation reactions of tetramethyldisilazanes and their derivatives

Hydrosilylation between 1,1,3,3-tetramethyldisilazane (A) and 1,3-divinyl-1,1,3,3-tetramethyldisilazane (B) occurs rapidly at 90 °C in the presence of Karstedtʹs catalyst to give a product mixture consisting mainly of large macrocycles. Deprotonation–substitution reactions of these macrocycles were largely unsuccessful. Trimethylsilylated and methylated derivatives of A and B were prepared and used in hydrosilylation reactions. High-yield formation of large macrocycles was observed when the trimethylsilylated or methylated derivative of B was reacted with unmodified A. The methylated product was successfully deprotonated and functionalized with trimethylsilyl groups.