Precise synthesis of cyclic polysilanes and the relative productsvia nickel and palladium key intermediates

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This research covers selective preparation between linear and cyclic polysilanes catalyzed by nickel-phosphine catalysts and suggests their reaction mechanism on the basis of chemical properties for the cyclic palladium intermediates. Formation of the cyclic polysilanes and the cyclic intermediates is attributed to be higher thermally stable than the linear one. A new concept of polysilanes involving π-stacking interaction at the side substituents exhibits the unique optical properties.