Add time:08/14/2019 Source:sciencedirect.com
Vicarious nucleophilic substitution of hydrogen (VNS) with chloromethyl tolyl sulfone carbanion does not occur in 3-, 4- and 5-nitrosalicylaldehydes. Instead, nucleophilic addition to the carbonyl group takes place leading to 2-hydroxydihydrobenzofurans. The same reaction course is observed for other salicyl aldehyde derivatives.
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