TERMINATION OF CARBOSILANE DENDRIMERS BASED ON HEXAALLYLETHYLENEDISILANE AS CORE MOLECULE

Dendritic carbosilanes based on hexaallylethylenedisilane ((CH2=CHCH2) (3)SiCH2)(2) as a core molecule and allyl-groups as growth generation have been prepared. The reaction path of the repetitive hydrosilation- alkenylation cycles is revealed by NMR spectroscopy. Each of the two s teps (hydrosilation-alkenylation process) provided quantitative yields of pure dendrimers. The termination of the dichloromethylsilyl-group contained third generation (G3P with ClMe2Si-groups) and chlorodimethy lsilyl-group contained fourth generation (G4P with ClMe2Si-groups) wit h allylmagnesium bromide, p-bromophenol, p-phenylphenol, lithium alumi num hydride and lithium phenylacetylide are performed. All of the term inated dendrimers can be obtained as a pure substance after simple chr omatographic purification. They are characterized by the use of spectr oscopic analyses (NMR, MALDI mass, UV and IR) as well as elemental ana lyses.