Expeditious and efficient syntheses of pure 4-methyl and 4,6-disubstituted dibenzothiophenes

Article abstract of DOI:10.1016/0040-4020(96)00459-0

4-Lithio and 4,6-dilithiodibenzothiophenes were efficiently obtained by lithiation of dibenzothiophene with BuLi and BuLi-TMEDA, respectively. Very pure 4-methyl- and 4,6-dimethyldibenzothiophenes, substrates of great request in hydrosulfirization studies were easily prepared, on large scale and in excellent yields.