Citation:
YANG Liu, LU Mingda, ZHANG Lancui, ZHANG Bai, SUN Hang, ZHU Zaiming. Synthesis of Cyclohexanone Ethylene Ketal Catalyzed by Keggin Type Biimidazole Tungstogermanate[J]. Chinese Journal of Applied Chemistry,
;2014, 31(11): 1310-1316.
doi:
10.3724/SP.J.1095.2014.30653
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A Keggin-type biimidazole tungstogermanate(H4biim)[H2GeW12O40]·18H2O(1b,H2biim=2,2'-biimidazole),as a catalyst for the synthesis of cyclohexanone ethylene ketal,was designed and synthesized.It was characterized by single crystal X-ray diffraction analysis,infrared spectroscopy(FT-IR),ultraviolet spectroscopy(UV),themogravimetry-differential thermal analysis(TG-DTA) and X-ray powder diffraction(XRD).Factors,such as the molar ratio of cyclohexanone to ethylene glycol,catalyst loading and reaction time,on the yield were investigated.The experimental results show that the product yield reaches 90% under the optimal conditions:n(cyclohexanone):n(1,2-ethanediol)=1:1.4,n(1b,based on W):n(cyclohexanone)=1:260,reaction time is 2 h.The catalyst can be reused and has good stability in the catalytic reaction.
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