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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 shu

Synthesis of Cyclohexanone Ethylene Ketal Catalyzed by Keggin Type Biimidazole Tungstogermanate

1.
School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China

Corresponding author: ZHANG Lancui, ZHU Zaiming,
Received Date: 23 December 2013
Available Online: 11 March 2014
Fund Project: 辽宁省自然科学基金(2013020128) (2013020128)辽宁省教育厅科学研究基金(L2013414)资助项目 (L2013414)

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.
- Keggin-type structure,
- tungstogermanate,
- biimidazole,
- carbonyl-protecting,
- catalysis
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