スタンナシクロヘプタトリエニルジアニオンの合成とその反芳香族性

概要

In contrast to many synthetic examples of aromatic compounds containing heavier group 14 elements,1 studies on heavy anti-aromatics are rather limited.

Matsuo′s group synthesized heavy analogs of cyclobutadiene, the tetrasila- and tetragerma-cyclobutadienes, but these compounds were concluded to be non-aromatic with the charge localized structures.

2, 3 Iwamoto and his coworkers succeeded in the synthesis of the benzodisilacyclobutadiene that shows anti-aromaticity.4 However, synthetic examples of heavier congeners of anti-aromatic compounds have been reported for only cyclobutadiene analogs.

Cycloheptatrienyl anion is a seven-membered ring compound that shows anti-aromaticity with an 8π-electron system. Herein, we report the synthesis and electronic structures of a stannacycloheptatrienyl anion and a further reduced dianion species.

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