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Catalytic synthesis of acetals and ketals with H3PW12O40/PAn

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Rare Metals 2008年第1期27卷 89-94页

作者： YANG Shuijin ZHANG Yijun DU Xinxian Philippe G. Merle Hubei Key Laboratory of Bioanalytical Technique Department of Chemistry and Environmental Engineering Hubei Normal University Huangshi 435002 China Department of Chemistry and Biochemistry Concordia University Montreal H4B 1R6 Canada

A new environmental friendly catalyst H3PW12O40/PAn was prepared and identified by means of FT-IR,XRD,and TG/*** optimum conditions have been found;that is,the mass ratio of PAn to H3PW12O40 is 1：1.5,the volume of methanol is 20 mL,and the reflux reaction time is 3 *** structural identity of Keggin units is preserved after the incorporation into polyaniline *** activities of H3PW12O40/PAn in synthesizing 2-methyl-2-ethoxycarbonylmethyl-1,3-dioxolane,2,4-dimethyl-2-ethoxycarbonylmethyl-1,3-dioxolane,cyclohexanone ethylene ketal,cyclohexanone 1,2-propanediol ketal,butanone ethylene ketal,butanone 1,2-propanediol ketal,2-phenyl-1,3-dioxolane,4-methyl-2-phenyl-1,3-dioxolane,2-propyl-1,3-dioxolane,and 4-methyl-2-propyl-1,3-dioxolane were *** has been demon-strated that H3PW12O40/PAn is an excellent *** factors concerned in these reactions were *** optimum conditions are as follows：the molar ratio of aldehyde/ketone to glycol（r） is 1：1.5,the mass ratio of the catalyst used to the reactants is 0.6%,and the reaction time is 1.0 *** these conditions,the yield is as follows：2-methyl-2-ethoxycarbonylmethyl-1,3-dioxolane,69.0%;2,4-dimethyl-2-ethoxycarbonylmethyl-1,3-dioxolane,79.5%;cyclohexanone ethylene ketal,78.9%;cyclohexanone 1,2-propanediol ketal,85.3%;butanone ethylene ketal,56.9%;butanone 1,2-propanediol ketal,78.1%;2-phenyl-1,3-dioxolane,76.3%;4-methyl-2-phenyl-1,3-dioxolane,94.2%;2-propyl-1,3-dioxolane,70.7%;and 4-methyl-2-propyl-1,3-dioxolane,79.2%.

关键词： phosphotungstic acid acetal ketal polyaniline catalysis

Synthesis of a Novel Carbon Based Acid Catalyst and Its Catalytic Activity for the Acetalization and ketalization

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Chinese Journal of Chemistry 2007年第12期25卷 1795-1797页

作者：梁学正高珊程文萍王雯娟杨建国 Shanghai Key Laboratory of Green Chemistry and Chemical Process East China Normal University Shanghai 200062 China

A novel carbon based strong solid acid catalyst has been synthesized successfully. The catalytic activity for acetalization and ketalization was investigated. The results showed that the novel catalyst was very efficient with the average yield over 92%. The novel heterogeneous catalyst also has the advantages of high activity, wide applicability even to the preparation of 7 membered ring acetals and ketals, strikingly simple workup procedure, non-pollution and reusability, which will contribute to the green process greatly.

关键词： novel carbon based catalyst acetal ketal catalyst efficient

Polyaniline Supported 12-Tungstosilicic Acid as the Catalyst for Acetals and ketals Synthesis

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Journal of Wuhan University of Technology(Materials Science) 2009年第3期24卷 371-375页

作者：杨永金 PHILIPPE G Merle Hubei Key Laboratory of Pollutant Analysis & Reuse Technology College of Chemistry and Environmental Engineering Hubei Normal University Department of Chemistry and Biochemistry Concordia University

A novel environmental friendly catalyst, H4SiW12O40/PAn was prepared and identified by FT-IR, XRD and TG/DTA. The optimal synthetic protocol was a PAn to H4SiW12O40 mass ratio of 1 ： 1, a 20 mL of methanol and a reaction time of 2 h at reflux. It was used in catalytic synthesis of ten important ketals and acetals with a high catalytic activity. With an aldehyde/ketone to glycol molar ratio of 1 ： 1.5 and a 1 wt% catalyst loading, the yields of ketals and acetals could reach 60.0%- 93.8 % after 1 h.

关键词： 12-tungstosilicic acid polyaniline acetal ketal catalysis

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杂多酸(HPA)催化制取环缩酮和缩醛

化学研究与应用 1989年第1期1卷 90-92页

作者：雷庆英傅相锴罗必奎西南师范大学化学系

本文在文[1—4]的基础上,报导以杂多酸为催化剂制取环缩酮和缩醛。杂多酸是一种固体酸,是近年来国内外学者广泛关注的多功能催化剂,可作为固体酸催化剂进行酯化、醇脱水、烯烃水合制醇、烯烃加醇制醚以及付克烷基化反应等;

关键词： Heteropoly acid ketal acetal.

An Efficient Cleavage of 1,3-Dioxolane Using ZnCl_2/THF/H_2O

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Chinese Chemical Letters 2000年第2期11卷 95-96页

作者： Li Gong OU Dong Lu BAI (Shanghai Institute of Materia Medica, the Chinese Academy of sciences 294 Taiyuan Road, Shanghai, 200031) Shanghai Institute of Materia Medica Chinese Academy of Sciences 294 Taiyuan Road Shanghai 200031 China

A new. mild and efficient method for the cleavage of 1,3-dioxolane is reported.

关键词： 1,3-Dioxolane ketal deprotection