Monatshefte fur Chemie p. 469 - 473 (1996)
Update date:2022-08-17
Topics:
Westernacher
Kisch
A SiO2 supported Rh(I) catalyst of trisulfonated triphenylphosphine catalyzes the addition of diphenylacetylene to azobenzene in refluxing butanol in the presence of triphenylphosphine to afford N-anilino-2,3-diphenylindole and 2,3-diphenylindole with turnover numbers of 80 and 20, respectively. As compared to the known homogeneous or heterogeneous (SiO2) catalysis by RhCl(PPh3)3, the supported aqueous phase system retains a constant turnover frequency throughout the reaction and can be partially recycled.
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