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classic carbocation – EUREKAMOMENTS IN ORGANIC CHEMISTRY https://amcrasto.theeurekamoments.com DR ANTHONY MELVIN CRASTO Ph.D, WorldDrugTracker, Glenmark scientist ( Ph.D, ICT) helping millions with chemistry websites, million hits on google sites, Intention is to help chemists across the world, content is academic Mon, 08 Jul 2013 04:00:03 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 Crystal structure closes classic carbocation case https://amcrasto.theeurekamoments.com/2013/07/08/crystal-structure-closes-classic-carbocation-case/ Mon, 08 Jul 2013 03:43:29 +0000 http://amcrasto.theeurekamoments.com/?p=984 Continue reading Crystal structure closes classic carbocation case]]>  

norbornyl classical structure
Herb Brown favoured rapidly equilibrating classical enantiomers of the 2-norbornyl cation
norbornyl cation nonclassical structureWinstein proposed the nonclassical structure of the 2-norbornyl cation, now shown to be correct

F Scholz et al, Science, 2013, DOI: 10.1126/science.1238849

After more than 60 years, crystals of the 2-norbornyl cation have finally put its ‘nonclassical’ structure, with a pentacoordinate carbon, beyond doubt
German scientists have solved the long-sought crystal structure of an ion at the frontline of a war of interpretation that raged for years. Karsten Meyer from Friedrich-Alexander-University in Erlangen and his teammates have ended a 64 year wait for this most definitive evidence of ‘nonclassical’ 2-norbornyl carbocation structures. ‘The crystallography was a tour-de-force,’ Meyer tells Chemistry World. ‘The procedure is insane – it put us through torture.
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