Disilenyl Silylene Reactivity of a Cyclotrisilene

Publisher： John Wiley & Sons Inc

E-ISSN： 1521-3773|57|9|2445-2449

ISSN： 1433-7851

Source： ANGEWANDTE CHEMIE INTERNATIONAL EDITION, Vol.57, Iss.9, 2018-02, pp. : 2445-2449

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Abstract

AbstractThe highly reactive silicon congeners of cyclopropene, cyclotrisilenes (c‐Si3R4), typically undergo either π‐addition to the Si=Si double bond or σ‐insertion into the Si−Si single bond. In contrast, treatment of c‐Si3Tip4 (Tip=2,4,6‐iPr3C6H2) with styrene and benzil results in ring opening of the three‐membered ring to formally yield the [1+2]‐ and [1+4] cycloaddition product of the isomeric disilenyl silylene to the C=C bond and the 1,2‐diketone π system, respectively. At elevated temperature, styrene is released from the [1+2]‐addition product leading to the thermodynamically favored housane species after [2+2] cycloaddition of styrene and c‐Si3Tip4.

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