No abstract

No abstract

A series of novel pyrazolyl biscoumarins was synthesized at 80 C in a one pot procedure using an Fe 3+ incorporated mesoporous silicate catalyst (FeTUD-1). The wormhole structured FeTUD-1 catalyzed the condensation of pyrazole aldehyde (1,3-diphenyl-1H-pyrazole-4-carbaldehyde) and 4-hydroxy coumarin to give the product in $85% yield. XRD and N 2 sorption studies of FeTUD-1 confirmed its amorphous, mesoporous nature, which possessed a large surface area of 638 m 2 g À1 and a pore diameter of 9.4 nm.The nature of Fe 3+ ion co-ordination within the silica matrix was evaluated by different techniques including diffuse reflectance UV-Vis, FTIR, and EPR. FeTUD-1 possessed both Brønsted and Lewis acidity, as measured by FTIR of pyridine adsorption, that are responsible for the observed activities.

No abstract

A convenient, solvent‐free Vilsmeier reagent is experimented under neat condition (both thermal and microwave conditions). An efficient method for the synthesis of various substituted 1H‐pyrazole‐4‐carboxylic acid esters is reported.