摘要
以丙二酸二乙酯和1,4-二溴丁烷为起始原料,经烷基化、酯还原和醚化反应合成环戊基-1,1-二甲醇二甲醚,分别考察关键因素对3步合成反应的影响。适宜的工艺条件为:①烷基化反应时,n(丙二酸二乙酯)∶n(CsOH)∶n(1,4-二溴丁烷)=1.0∶2.2∶1.4,CsOH为催化剂,环戊基-1,1-二甲酸二乙酯的收率为93.0%;②酯还原反应时,以无水ZnCl2为催化剂,n(环戊基-1,1-二甲酸二乙酯)∶n(KBH4)=2.0∶1.0,环戊基-1,1-二甲醇的收率为88.1%;③醚化反应时,以四丁基溴化铵为催化剂,n(环戊基-1,1-二甲醇)∶n(NaOH)∶n(碳酸二甲酯)=1.0∶8.0∶2.4,环戊基-1,1-二甲醇二甲醚的收率为61.2%。
1,1-Cyclopentyl dimethanoldimethyl ether was synthesized from diethyl malonate and 1,4-dibromo butane by alkylation, ester reduction and etherification. The key factors affecting reactions were studied and the optimal reaction conditions were found as follows: (1) for alkylation,using CsOH as catalyst,n(diethyl malonate) : n(CsOH) : n(1,4-dibromo butane)= 1.0 : 2.2: 1.4,the yield of cyclobutane-1,1-dicarboxylic acid diethyl ester was 93.0%;(2)for ester reduction, using anhydro-ZnCl2 as catalyst,n(cyclopentyl-1,1-dicarboxylic acid diethyl ester) : n (KBH4) = 2.0 : 1.0, the yield of 1,1-cyclopentyl dimethanol was 88. 1%; (3)for etherification, using tetrabutyl ammonium bromide as catalyst, n(1,1-cyclopentyl dimethanol) n(NaOH) : n(dimethyl carbonate) = 1.0 : 8.0 : 2.4, the yield of 1,1- cyclopentyl dimethanoldimethyl ether was 61.2%.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2011年第9期19-22,共4页
Petroleum Processing and Petrochemicals
基金
国家自然科学基金项目(20566004)
国家科技攻关计划项目(2001BA323C)