Citation:
HE Jie-Yu, LIAO De-Zhong. Catalytic Synthesis of Ketal over Zirconium Oxychloride[J]. Chinese Journal of Applied Chemistry,
;2005, 22(9): 1002-1006.
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The acid property of zirconium oxychloride was characterized by means of DTA and FT-IR spectra of pyridine absorbed on the surface. Its acid strength was estimated with Hammett indictor. With ketalization between cyclohexanone and 2, 3-butanediol as a probe reaction, the optimum conditions were obtained. ZrOCl2 catalytic activity in other ketalization was investigated and its catalytic activity was compared with those of other catalysts in ketalization. The results show that the catalyst has Broensted acid centers that could change the color of Hammett indictor (p-nitrophenylamine). The yield of cyclohexanone 2, 3-butanediol ketal is 96. 5% under the optimum conditions, and it shows excellent catalytic activity in other ketal synthesis. The catalyst could be recovered easily and the post-treatment was simple. No waste acid was discharged. The drawback brought by using conventional liquid inorganic acid to catalyze ketalization could be avoided. It is an environmental friendly catalyst to ketalization.
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