1,4-二乙氧基苯的相转移催化合成

Synthesis of 1,4-Diethoxybenzene Catalyzed by Phase Transfer Catalyst

采用大孔型交联聚苯乙烯为载体研制出新型季 钅盐型相转移催化剂Y98B ,并将其应用于 1 ,4-二乙氧基苯的催化合成反应 ,产品进行了红外光谱分析和熔点测定 ,探讨了催化剂用量、对苯二酚与溴乙烷物质的量比、反应温度和反应时间等动力学条件对产品收率的影响。确定了在反应温度为 70℃、对苯二酚∶溴乙烷 (摩尔比 )为 1∶3.5、反应时间为 4h、催化剂用量为 3.0g的条件下产品收率可达 84.3%

A new type of quaternary phosphine salt polystrene-supported phase transfer catalyst has been prepared. It was used for synthesizing 1,4-diethoxybenzene.Experiment results showed that under the conditions of 70℃,with weight of catalyst of 3.0g, paradioxybenzene- monbromethane ratio (mol)1∶3.5 and a reaction time of 4h, a yield of 84.3% can be obtained.