Dendritic polyols based on carbosilanes ‐ lipophilic dendrimers with hydrophilic skin

AbstractCarbosilane dendrimers with up to 108 end groups were prepared by a divergent synthetic route via repeated alternating Grignard‐reaction with allylmagnesium bromide and hydrosilylation. Quantitative hydroboration of the dendrimers was achieved with 9‐BBN/H2O2,OH−. Employing this synthetic route, rather monodisperse dendritic polyols with lipophilic carbosilane core and hydrophilic shell were prepared. All dendrimers were characterized with MALDI‐TOF, showing low polydispersities. The novel dendritic polyols constitute interesting molecular scaffolds for the preparation of unusual supermolecules. As an example, reaction with cholesteryl chloro‐formiate was used to prepare a series of dendrimers with 12, 36 and 108 mesogenic cholesteryl end groups.