Issue Date: December 19, 2016
Six bonds to carbon: Confirmed
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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