Intramolecular cyclisations of biphenyl-2-carboxyl radicals: evidence for a II-state aroyloxyl radical
作者:Stephen A. Glover、Stephen L. Golding、Andr� Goosen、Cedric W. McCleland
DOI:10.1039/p19810000842
日期:——
Biphenyl-2-carboxylradicals generated by homolysis of acyl hypoiodites cyclise intramolecularly giving mainly δ-lactones through Ar2-6 cyclisation. 2′-Alkoxybiphenyl-2-carboxyl radicals do not give the expected Ar1-5 cyclisation product but undergo a homolytic ipso-substitution of the 2′-substituent. The phenanthrene-4-carboxyl radical gives 5H-phenanthro[4,5-bcd]pyran-5-one. Consideration of the