Synthesis of New Silylated and N-Si-N bridged Urea Derivatives from Aminosilanes and Diisocyanates.

Urea derivatives of the general motifs R(N(SiMe)C(O)NRR) and [R(NC(O)NRR)SiMe] (R=difunctional organic linker, i. e., core of diisocyanate used; R,R= H,Pr; H,Ph; Et,Et) were synthesized by insertion of four different diisocyanates (1,6-HMDI, 2,4-TDI, 1,3-TMXDI and 4,4'-MDI) into aminotrimethylsilanes MeSiNRR and diaminodimethylsilanes MeSi(NRR).