A General Strategy for Synthesizing Cubeoctameric Silsesquioxanes Containing Polymerizable Functional Groups

Abstract

A general method has been developed for the preparation of silsesquioxanes with potentially polymerizable p,p′-disubstituted diphenylmethyl groups attached to one vertex of the “T₈” framework, including [Cy₇Si₈O₁₂(CH₂)₄CH(C₆H₄OH)₂] (9a), [Cy₇Si₈O₁₂(CH₂)_l0CH-(C₆H₄OH)₂] (9b),[Cy₇Si₈O₁₂(CH₂)₄CH(C₆H₄NH₂)₂] (10a), [Cy₇Si₈O₁₂(CH₂)₁₀CH(C₆H₄ NH₂)₂] (10b), [Cy₇Si₈O₁₂(CH₂)₄CH(C₆H₄CO₂H)₂] (14). The reaction of [Cy₇Si₈O₁₂CH₂CH₂CO₂CH₃] (2) with BrMgC₆H₄OCH₂Ph (6a) affords an interesting disilanol derived from the hydrolytic cleavage of one Si-O-Si linkage in a completely condensed T₈ framework.