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The nucleophilicity parameters of stabilized sulfur ylides, methylsulfonyl-, and methylsulfinyl stabilized carbanions have been determined from the rates of their reactions with benzhydrylium ions and quinone methides. Direct comparisons of the nucleophilic reactivities of sulfur and phosphorus ylides as well as their related carbanions have now become possible.
Appel et al. (Tue,) studied this question.