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U. V.  Desai, Thopate, T. S., Pore, D. M., and Wadgaonkar, P. P., ?Efficient, solvent-free method for the chemoselective synthesis of acylals from aldehydes and their deprotection catalyzed by silica sulfuric acid as a reusable solid acid catalyst?, Catalysis Communications, vol. 7, no. 7, pp. 508-511, 2006.\par \par A. K.  Bhattacharya, Mujahid, M., and Natu, A. A., ?Efficient method for the synthesis of acylals from aldehydes under solvent-free conditions catalyzed by antimony trichloride?, Synthetic Communications, vol. 38, no. 1, pp. 128-134, 2008.\par \par S. P.  Borikar and Daniel, T., ?Convenient and efficient protocol for the synthesis of acylals catalyzed by bronsted acidic ionic liquids under ultrasonic irradiation?, Ultrasonics Sonochemistry, vol. 18, no. 5, pp. 928-931, 2011.\par \par }