A stable free tetragermacyclobutadiene incorporating fused-ring bulky EMind groups.

Katsunori Suzuki,Yasuyuki Numata,Naoko Fujita,Naoki Hayakawa,Tomoharu Tanikawa,Daisuke Hashizume,Kohei Tamao,Hiroyuki Fueno,Kazuyoshi Tanaka,Tsukasa Matsuo

CHEMICAL COMMUNICATIONS（2018）

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摘要

The first free cyclobutadiene (CBD) germanium analogue was obtained as room-temperature stable dark red crystals via the reaction of the bulky EMind-substituted 1,2-dichlorodigermene with lithium naphthalenide. The cyclic 4-electron antiaromaticity is essentially stabilized by the polar Jahn-Teller distortion in the germanium CBD producing a planar rhombic-shaped charge-separated structure.

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