Abstract
Cerium(III) chloride heptahydrate (CeCl3·7H2O) catalyzes the reaction of substituted salicylaldehydes with 1,3-cyclohexane dione or dimedone in aqueous medium at reflux temperature to afford the corresponding 1-oxo-1,2,3,4,9,10-hexahydroxanthene derivatives4 0 in high yields.
ACKNOWLEDGMENT
K. S. thanks University Grants Commission, New Delhi, for the award of a fellowship.
Notes
a All products were characterized by spectral data and compared with authentic samples.
b Isolated pure products.