Electrophilic Substitution of Hydrogen in Betulin and Diacetylbetulin
Russian Journal of Organic Chemistry(2018)
摘要
Betulin and diacetylbetulin, which can be regarded as sterically hindered alkenes, reacted with N -chloro-, N -bromo-, and N -iodosuccinimides to give products of allylic and vinylic substitution in quantitative overall yield. The contribution of allylic substitution increases in the series Cl < Br < I. Quantum chemical simulation of the reactions of diacetylbetulin with N -halosuccinimides showed that, regardless of the electrophile power, all reactions involve open-chain carbocationic intermediates. The direction of deprotonation of the latter with formation of allylic or vinylic substitution products is determined by preferential orientation of the vacant orbital and C–Hlg bond.
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关键词
hydrogen,betulin
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