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A large variety of carbonyl substrates can be allylated with 1 under neutral conditions. In the case of dicarbonyl compounds, products 2 form chemoselectively. The driving force of this reaction is ascribed to the latent Lewis acidity, which is induced by chelation of neutral, bidentate bis(stannane)s on the carbonyl group (structure A).
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Asao et al. (1997) studied this question.
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