Synthesis of 6-, 7- and 8-membered cyclosiloxanes having multifunctional groups

Cyclosiloxanes having intramolecular donor atoms, a Si–Si bond, and vinyl groups were synthesized as useful precursors for ring-opening polymerization. 1,1,3,3-Tetrakis(dimethylaminomethylphenyl)-5,5-dimethylcyclotrisiloxane was also synthesized and characterized by single crystal X-ray structural analysis, which shows strong coordination from N to Si in the solid state.