“…Thus, formylation of pyrroles (112,220,240,246), tetrahydroquinolines e 38 ), indoles e SO ,306), naphthostyryl e 79), carbazoles (82,84,238), benzazepines e 29 ), thiophenes (86,180, 181,236,301,302), 2,2'-bithenyl e 1 ), thionaphthenes e 79), thiazines (84), dithiadienes e 25 ), sydnones e S ), and other heterocycles e 30 ) are reported. In the pyrrole series ketones are sometimes obtained in good yield e 12).…”