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nBu4NBr/PbI2 acts as an effective catalyst for the allylation of aldehydes 2 with the allylic tin reagents 1 in water. A high syn-selectivity of 3 was achieved in water without any aprotic solvents in the reaction of the aromatic aldehydes 2 with the crotyltri-n-butyltin reagents 1b, 1c irrespective of their E/Z geometry.
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Shibata et al. (2001) studied this question.
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