Homolytic Aromatic Substitutions of Pentatomic Heteroaromatics with Electrophilic Carbon Radicals Generated by Alkyl Halides and Triethylborane.

Abstract An efficient homolytic aromatic substitution of pyroles, furan and thiophene by ·CH2CO2Et and ·CH(CH3)CO2Et has been carried out, the radicals being generated by autoxidation of BEt3 in the presence of XCH2CO2Et and XCH(CH3)CO2Et (X=Br, I).