Acetalization of α,β-unsaturated carbonyl compounds catalyzed by complexes of Pt(II)
作者:Enrico Nieddu、Maurizio Cataldo、Francesco Pinna、Giorgio Strukul
DOI:10.1016/s0040-4039(99)01419-7
日期:1999.9
sufficiently Lewis acidic to catalyze the acetalization of aldehydes and ketones. α,β-Unsaturated substrates can be easily acetalized with ethylene glycol under mild conditions in high yield and avoiding side reactions leading to formation of undesired by-products arising from the nucleophilic addition to the carboncarbon double bond conjugated to the carbonyl group. A comparison of the behavior of a Pt
一类Pt(II)的阳离子二膦配合物具有足够的路易斯酸性,可以催化醛和酮的缩醛化。α,β-不饱和底物可以在温和的条件下容易地用乙二醇缩醛化,收率很高,并且避免了副反应,该副反应导致形成不希望的副产物,该副产物是由与羰基共轭的碳碳双键的亲核加成而形成的。在相同条件下,Pt络合物相对于PTSA作为催化剂的行为比较表明,在许多情况下,前者具有优越的选择性。