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Table 1 The reaction in solvent-free condition at room temperature

From: Zirconia-based catalyst for the one-pot synthesis of coumarin through Pechmann reaction

Entry Reactant Catalyst Temperature (°C) Time (min.) %Yield M.P.
1 Resarcinol + ethylacetoacetate ZrO2-TiO2 R.T. 180 97 184–187
2 Resarcinol + ethylacetoacetate ZrO2-ZnO R.T. 240 63 184–187
3 Resarcinol + ethylacetoacetate ZrO2/cellulose R.T. 180 N.R.
4 Catechole + ethylacetoacetate ZrO2-TiO2 80 240 min 55  
5 O-nitrophenol + ethylacetoacetate ZrO2-TiO2 80 240 N.R.  
6 Resarcinol + ethylacetoacetate Without catalyst 80 240 N.R.
  1. N.R. no reaction, M.P. melting point