Carbosilane dendrimers with shielded hydroxyl groups at silicon atoms

Two synthetic routes to carbosilane dendrimers bearing hydroxyl groups were developed. Examination of physical and chemical interactions between hydro xyl groups by means of IR spectroscopy and gel-permeation chromatography al lowed the authors to infer that hydroxyl groups are involved in intra- and intermolecular interactions. Different arrangement of hydroxyl groups relat ive to the shielding methylbidecylsilyl fragments is responsible for the oc currence or absence of intermolecular condensation of functional dendrimers . It is demonstrated that, in some cases, hydroxyl groups of the inner sphe re that are uninvolved in reactions between dendrimers are accessible for t he exhaustive interaction with the low-molecular-mass reagents.