I. Amer et al., A CONVENIENT ROUTE TO 1,3,5-TRISUBSTITUTED BENZENES VIA RHODIUM-CATALYZED POLYMERIZATION OF ARYLACETYLENES, Journal of molecular catalysis, 85(2), 1993, pp. 163-171
[(1,2,5,6-eta)-1,5-Cyclooctadiene] (1,3-propanediamine-N,N')rhodium(1) chloride, [(COD)RhCl(H2NCH2CH2CH2NH2)]Cl, 11, and the water soluble
complexes (COD) RhCl(Ph2PC6H4-3-SO3Na) 10, trans-[Rh(CO)(Ph2PC6H4-3-CO
2H) (mu-NCMe=CHCMe=N)]2 12, (Ph2PC6H4-2-CO-O)-Rh(CO) (NHMe=CHCMe=N) 13
a, (Ph2PC6H4-2-CO-O)-Rh(CO)(indazole) 13b and trans-[Rh(CO)(Ph2PC6H4-2
-CHO)(mu-NCMe=CHCMe=N)]2 14 were shown to catalyze the polymerization
of PhC=CH 1 and the substituted arylacetylenes 2-8 at 25-degrees-C in
a stereoregular manner. The cis-oriented poly (arylacetylenes), so for
med, were found to depolymerize selectively at 200-225-degrees-C to th
e corresponding 1,3,5-triarylbenzene derivatives.