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活性炭负载磷钨杂多酸催化合成缩醛(酮)
引用本文:杨水金,杜心贤,吕宝兰.活性炭负载磷钨杂多酸催化合成缩醛(酮)[J].北京化工大学学报(自然科学版),2005,32(1):81-84.
作者姓名:杨水金  杜心贤  吕宝兰
作者单位:湖北师范学院化学与环境工程系, 湖北 黄石 435002
基金项目:湖北省优秀中青年创新团队资助项目 , 湖北省教育厅科研项目
摘    要:以活性炭负载磷钨杂多酸为催化剂,对以乙酰乙酸乙酯、环己酮、丁酮、苯甲醛和正丁醛与二元醇(乙二醇,1,2-丙二醇)为原料合成10种缩醛(酮)的反应条件进行了研究,较系统地研究了醛/酮与二元醇摩尔比、催化剂用量、反应时间诸因素对收率的影响。结果表明,在n(醛或酮)∶n(乙二醇或1,2-丙二醇)=1∶1.5,催化剂的用量占反应物料总质量的1.0%,反应时间为1h条件下,10种缩醛(酮)的收率在60.0%~95.4%之间。

关 键 词:磷钨酸  缩醛  缩酮  活性炭  催化  磷钨酸  缩醛  缩酮  活性炭  催化
收稿时间:2004-09-11
修稿时间:2004年9月11日

Synthesis of acetals and ketals catalyzed by phosphotungstic acid supported on active carbon
YANG Shui,jin DU Xin,xian LV Bao,lan.Synthesis of acetals and ketals catalyzed by phosphotungstic acid supported on active carbon[J].Journal of Beijing University of Chemical Technology,2005,32(1):81-84.
Authors:YANG Shui  jin DU Xin  xian LV Bao  lan
Institution:Department of Chemistry and Environmental Engineering, Hubei Normal University, Hubei Huangshi 435002,China
Abstract:Catalytic activities of the active carbon supported with phosphotungstic acid were reported for 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. It is demonstrated that the active carbon supported with phosphotungstic acid is an excellent catalyst. Various factors concerned in these reactions were investigated. The optimum conditions are found, that is, the molar ratio of aldehyde / ketone to glycol 1/1.5, the mass percent of the catalyst used to the reactants 1.0%, and the reaction time 1h. Under these conditions, the yield of 2-methyl-2-ethoxycarbonylmethyl-1,3-dioxolane is 76.4%, and 2,4-dimethyl-2-ethoxycarbonylmethyl-1,3-dioxolane 75.8%, the yield of cyclohexanone ethylene ketal 70.8%, and cyclohexanone 1,2-propanediol ketal 83.3%, the yield of butanone ethylene ketal 60.0%, and butanone 1,2-propanediol ketal 84.6%, the yield of 2-phenyl-1,3-dioxolane 83.0%, and 4-methyl-2-phenyl-1,3-dioxolane 81.3%, the yield of 2-propyl-1,3-dioxolane 91.4%, and 4-methyl-2-propyl-1,3-dioxolane 95.4%.
Keywords:phosphotungstic acid  acetal  ketal  active carbon  catalysis
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