Solvent-Free Heteropolyacid-Catalyzed Glycerol Ketalization at Room Temperature.

Among the tested heteropolyacids H3PW12O40 proves to be the best suited heteropolyacid catalyst for the regioselective ketalization of glycerol to furnish selectively the 1,3-dioxolan-4-methanols (III) in this solvent-free protocol.