Polymenthylenebiphenyl polyanions by metallation—elimination
作者:Dieter Wilhelm、Timothy Clark、Paul von Ragué Schleyer
DOI:10.1016/s0040-4039(00)88351-3
日期:1982.1
The 3,3′,5,5′-tetramethylenebiphenyltetraanion, prepared in good yield by metallation-elimination, gives tetrasubstituted biphenyl derivatives, e.g., with H2O, D2O, methyl iodide, and trimethylsilyl chloride. The reaction sequence, starting from alkylated cyclohexanones, provides a general synthetic route to symmetrical polysubstituted biphenyls.
The semi-hydrogenation of terminalalkynes is successfully achieved with NaBH4 catalyzed by recyclable palladium nanowires (PdNWs) under ambient conditions. With only 0.32 mol % of catalyst loading, the reaction gives the hydrogenated products with up to 98 % overall yields, in which 97 % are semi-hydrogenated products. The method expands the application of metal nanomaterials in organic syntheses