Efficient acetalisation of aldehydes catalyzed by titanium tetrachloride in a basic medium
作者:Angelo Clerici、Nadia Pastori、Ombretta Porta
DOI:10.1016/s0040-4020(98)00982-x
日期:1998.12
The acetalisation of aliphatic and aromatic aldehydes is achieved in a basic medium by using catalytic amount of Ti(IV) chloride in MeOH in the presence of NH3 or Et3N. The present protocol shows many advantages over the well known base or acid catalysis: in fact, in contrast to base-promoted acetalisation, aldehydes with electron-rich carbonyl groups react easily, enolizable aldehydes do not undergo
在碱性介质中,通过在NH 3或Et 3 N的存在下在甲醇中使用催化量的Ti(IV)氯化钛(IV),可以在碱性介质中实现脂肪醛和芳香醛的缩醛化。:实际上,与碱促进的缩醛化反应相反,带有富电子羰基的醛容易反应,可烯化的醛不会发生醛醇缩合,并且与酸催化相反,在制备苯丙酸酯时不会发生双键迁移α,β-不饱和缩醛。图选项