Solvent-free, one-pot synthesis of pyrano[2,3-c]pyrazole derivatives in the presence of KF center dot 2H(2)O by grinding

A solvent-free, one-pot process for the preparation of 4H-pyrans in the presence of KF center dot 2H(2)O by grinding was achieved. Its advantages are easy workup, mild reaction conditions, high yields, and environmental friendliness.