Ml. Keshtov et al., SYNTHESIS OF NEW BIS[P-(PHENYLETHYNYL)PHENYL]HETARYLENES AND BIS[P-(PHENYLGLYOXALYL)PHENYL]HETARYLENES, Russian chemical bulletin, 45(9), 1996, pp. 2240-2242
A series of new bis[p-(phenylethynyl)phenyl] hetarylenes was obtained
by cross-coupling between heteroaromatic dibromides and phenylacetylen
e catalyzed by phosphine complexes of palladium in the presence of CuI
and an organic base. Bis[p-(phenylethynyl)phenyl]hetarylenes were oxi
dized to the corresponding bis[p-(phenylglyoxalyl)phenyl]hetarylenes u
sing the I-2-DMSO system.