摘要
以环境友好试剂氯化铈为催化剂,对苯甲醛与乙二醇的缩合反应进行了研究,考察了该绿色催化剂的用量、醇醛摩尔比、带水剂等因素对苯甲醛与乙二醇缩醛收率的影响。实验结果表明,氯化铈有较好的催化活性。在回流条件下,催化剂用量约占醛用量的0.8%摩尔分数,醇醛摩尔比为1.5∶1,带水剂环己烷的用量为10mL时,反应120min,苯甲醛与乙二醇缩醛收率达79.6%。
The acetal was synthesized in high yield by the reaction of benzaldehyde with ethylene glycol in the presence of a new environmentally friendly catalyst CeCl_3·7H_2O.The obtained results indicated that CeCl_3·7H_2O possessed a fairly high catalytic activity for this acetalization reaction.In this article ,the factors influencing the synthesis were discussed and the best conditions were determinded. The optimum conditions are as follows: the molar ratio of ethylene glycol to benzaldehyde is 1.5∶1, the molar ratio of catalyst to benzaldehyde is 0.8%; cyclohexane, better water-carrying agent to the reaction is 10 mL; reaction time is 120 min. Under the above conditions ,the yield of benazldehyde ethylene glycol acetal is up to 79.6 %.The results showed CeCl_3·7H_2O is an excellent catalyst for synthesizing benazldehyde ethylene glycol acetal.
出处
《稀土》
EI
CAS
CSCD
北大核心
2005年第2期19-21,共3页
Chinese Rare Earths
关键词
苯甲醛乙二醇缩醛
氯化铈
催化
benazldehyde ethylene glycol acetal
CeCl_3·7H_2O
catalyst
