2-Aroyl-3,5-diarylthiophenes were prepared in very good yields by reaction of 2,4,6-triarylpyrylium salts or 2,4,6-triarylthiopyrylium salts with an aqeous solution of sodium sulfide and iodine at room temperature.
DREVKO, B. I.;FOMENKO, L. A.;XARCHENKO, V. G., XIMIYA GETEROTSIKL. SOED.,(1989) N, S. 767-769