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Published in last 50 years
A series of stilbenes has been synthesised in one pot from benzyl alcohols and benzylidenetriphenylphosphorane through a Wittig-type olefination reaction in the presence of nickel nanoparticles.
Nickel nanoparticles (NiNPs) were generated from anhydrous nickel(II) chloride by treatment with lithium powder and a catalytic amount of 4,4¢-di-tert-butylbiphenyl (DTBB, 5 mol%) in THF at room temperature. The hydrogen-transfer reductive amination of aldehydes 1 with amines 2 was carried out in the presence of NiNPs in i-PrOH to give the corresponding products 3 in 30-99% yield (20 examples).