【摘要】 研究了在AlCl3催化下,丙三醇与环己酮、丁酮、丙酮、丙醛、丁醛、异丁醛、戊醛、异戊醛、正辛醛、二苯甲酮、苯甲醛等十余种醛(酮)的缩合反应。系统考察了反应时间、醛(酮)与醇的配比、AlCl3的用量及催化剂重复使用等因素对反应的影响,优化了反应条件。结果表明,当醛(酮)与丙三醇物质的量比为1∶1.2,催化剂用量为2g/mol醛(酮),反应2h,转化率可达99.2%,选择性可达100%。证明AlCl3对该缩合反应有较好的催化活性和选择性。更多还原

【Abstract】 The acetalization and ketalization of various aldehydes and ketones with glycerol by using AlCl₃ as catalyst are studied. Effects of reaction time, mole ratio of reactants and amount of catalyst on yield of acetals （ketals） were investigated. The optimum reaction conditions are as follows: molar ratio of aldehydes and ketones to glycerol is 1∶1.2, catalyst amount is 2 g per mole of aldehydes or ketones, reaction time is 2h. Under that condition, conversion rate is 99.2% and selectivity is 100%. And the results also show that AlCl₃ is an efficient catalyst for acetalization and ketalization with high catalytic activity and selectivity in mild conditions.更多还原