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Saul Winstein (October 8, 1912 – November 23, 1969) was a Canadian-American chemist who discovered the Winstein reaction. He argued a non-classical cation was needed to explain the stability of the norbornyl cation. This fueled a debate with Herbert C. Brown over the existence of ?-delocalized carbocations. Winstein also first proposed the concept of an intimate ion pair.

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