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Bulk gold powder, consisting of approximately 5–50 μm particles, catalyzes reactions of diazoalkanes E(H)C=N2, where E is CO2Et or PhC(O), with amines R1R2NH and O2 to give enamine products (R1R2N)(E)C=CH(E) in 58–94% yield. The reactions are proposed to occur by initial formation of surface-bound (E)(H)C: carbene groups that are attacked by nucleophilic amines. The enamine products are very different...
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