%0 Journal Article %A Masoud Mokhtary %A Faranak Najafizadeh %T Polyvinylpolypyrrolidone-bound boron trifluoride (PVPP-BF3); a mild and efficient catalyst for synthesis of 4-metyl coumarins via the Pechmann reaction %J Comptes Rendus. Chimie %D 2012 %P 530-532 %V 15 %N 6 %I Elsevier %R 10.1016/j.crci.2012.03.004 %G en %F CRCHIM_2012__15_6_530_0