Pd/C-mediated allylic substitution in water is described as an interesting alternative to classical homogeneous conditions. The reaction applied to allylic acetates showed a wide range of compatibility with various nitrogen, sulfur, oxygen, and carbon nucleophiles. Notably, the method features inexpensive reagents and a nontoxic solvent. Moreover, measurement of the palladium content in water by ICP-MS shows low palladium contamination (4 ppm) of the solvent, rendering this method safer for the environment compared to homogeneous conditions. The first asymmetric example of Pd/C-mediated allylic substitution is also disclosed.
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Felpin et al. (2005) studied this question.
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