作者:Cécile Boglio、Kevin Micoine、Pauline Rémy、Bernold Hasenknopf、Serge Thorimbert、Emmanuel Lacôte、Max Malacria、Carlos Afonso、Jean-Claude Tabet
DOI:10.1002/chem.200700010
日期:2007.6.25
catalyze Lewis acid mediated organic reactions, such as Mukaiyama aldol and Mannich-type additions. In particular, reactions with aldehydes, which were impossible with lanthanide polyoxotungstates, are made possible. Thus these modifications of the polyoxometalate composition allowed fine tuning of the Lewis acidity. The catalysts could be easily recovered and reused.
单腔聚氧钨酸盐[alpha(1)-P(2)W(17)O(61)](10-)和[alpha-PW(11)O(39)](7-)与HfCl(4)反应生成[α(1)-HfP(2)W(17)O(61)](6-)和[α-Hf(OH)PW(11)O(39)](4-),以有机可溶性形式分离四丁基铵(TBA)盐。随后的分析,包括质谱分析,表明它们比(TBA)(5)H(2)[alpha(1)-YbP(2)W(17)O(61)]强度更高。新的聚氧钨酸盐催化路易斯酸介导的有机反应,例如Mukaiyama aldol和Mannich型添加物。特别地,使得与醛的反应成为可能,这是镧系元素多氧钨酸盐不可能做到的。因此,多金属氧酸盐组合物的这些改性允许路易斯酸度的微调。催化剂可以容易地回收和再利用。