摘要:
The substitution of an O atom in the Cy8 Si8 O12 framework by a heteroatom or a heteroatom-containing group (Z) provides a simple route to discrete heterosilsesquioxane frameworks 1. In this reaction the Cy8 Si8 O12 framework is initially opened with triflic acid and then treated with different nucleophiles (Cy=cyclohexyl; Z=NPh, SO4 , nBuBO2 , CrO4 ).