How realistic is a resonance of the type A ↔ B ↔ C? This question could be answered from the NMR spectroscopic data of 1, the first representative of the 2-phosphonio-substituted 1-phospha-1-alkenes. A considerable amount of the resonance structures B and C was found in the actual structure of 1 (R = 2,4,6-tBu3C6H2).
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Karsch et al. (1986) studied this question.
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