Six bonds to carbon: Confirmed | Chemical & Engineering News
Volume 94 Issue 49 | p. 13 | Concentrates
Issue Date: December 19, 2016

Six bonds to carbon: Confirmed

Chemists obtain elusive crystal structure of hexamethylbenzene dication, confirming its nonclassical structure with a six-coordinate carbon atom
Department: Science & Technology
News Channels: Organic SCENE, Analytical SCENE
Keywords: chemical bonding, carbocation, aromaticity, magic acid, norbornyl cation

Among chemistry’s most fundamental concepts is that carbon is tetravalent and forms four bonds to other atoms. And when it comes to aromaticity, benzene’s hexagonal planar ring structure is taken as gospel. Chemists have thus been fascinated by finding exceptions to these truths. One example is hexamethylbenzene dication, C6(CH3)62+, a molecule first prepared in 1973 and suspected of not only having a six-coordinate carbon atom but also of being nonplanar. But the structure has only . . .

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