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Various acetal formation reactions were examined by a Keggin-type heteropolyacid. The reaction kinetics of the acetal formation was also investigated through comparison of heteropolyacids with other acid catalysts in the reaction between cyclohexanone and 1,2-butandiol to produce cyclohexanone ethylethylene acetal. Tungstosilicic acid was found to have a superior catalytic activity compared to other...