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A highly selective nucleophilic formylation is possible under mild conditions with bis(trimethylsilyl) ketone 1, a strawberry-colored oil. Thus, it reacts for example, with 2-cyclohexenone, undergoing 1,4-addition to give 2, which in turn yields 3 in the presence of moisture.
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Ricci et al. (1985) studied this question.
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