Reactions of triphenylborane with photoexcited ketones and with diazodiarylmethanes
作者:Angeld Alberti、Gian Franco Pedulli
DOI:10.1016/0022-328x(85)80392-2
日期:1985.12
Aromatic ketones and diones when exposed to UV irradiation in the presence of triphenylborane give R2ĊOBPh2 radicals through an SH2 displacement of phenyl from BPh3 by the excited triplet state of the carbonyl derivative. Very persistent radicals, characterized by g-factors higher than 2.0040, are obtained when boron is compelled to lie in the molecular plane owing to chelation by an electron-rich
The water-soluble copper complex generated in situ from CuCl2 and 2,2′-biquinoline-4,4′-dicarboxylic acid dipotassium salt (BQC), has been revealed as a highlyefficient and selective catalyst for the oxidation of secondary 1-heteroaryl alcohols to the corresponding heteroaromatic ketones with aqueous tert-butyl hydroperoxide, under mild conditions. The catalytic system is compatible with different