Novel fluoride ion mediated synthesis of unsymmetrical siloxanes under phase transfer catalysis conditions

Unsymmetrical siloxanes have been prepared from silanols or hydrosilanes using phase transfer catalytic (PTC) systems Me3SiN3–CsF–18-crown-6–toluene or Me3SiN3–CsF–18-crown-6–H2O–toluene, correspondingly. The target unsymmetrical siloxanes were prepared in yields up to 100%. Quantum chemical calculation of mechanism of unsymmetrical siloxanes formation has been performed.