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July 8, 2013
The Norbornyl Cation Structure (Really)
Here it is 2013, and the last shot has just now been fired in the norbornyl cation debate. I'm too young to have lived through that one, although it was still echoing around as I learned chemistry. But now we have a low-temperature crystal structure of the ion itself, and you know what? It's nonclassical. Winstein was right, Olah and Schleyer were right, and H. C. Brown was wrong.
Everyone's been pretty sure of that for a long time now, of course. But that article from Chemistry World has a great quote from J. D. Roberts, who is now an amazing 95 years old and goes back a long, long way in this debate. He's very happy to see this new structure, but says that it still wouldn't have fazed H. C. Brown: "Herb would be Herb no matter what happened", he says, and from everything I've heard about him, that seems accurate.
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