R. Kumar et al., PHASE-TRANSFER CATALYSIS BY TETRAETHYLAMMONIUM BROMIDE - REACTION OF FURYL, THIENYL AND INDOLYL CHALCONES WITH POTASSIUM SUPEROXIDE, INDIAN JOURNAL OF CHEMICAL TECHNOLOGY, 5(4), 1998, pp. 227-229
Reaction of tetraethylammonium superoxide (KO2/Et4NBr in DMF) with var
ious furyl, thienyl and indolyl chalcones (scheme 1) affords cleaved c
arboxylic acid(s) under significantly mild conditions. The investigati
on highlights the use of tetra-ethylammonium bromide (Et4NBr) as an ef
ficient phase transfer catalyst.