稀土化合物对双烯合成的催化作用

Catalysis of Lanthanide Complexes for Diene Synthesis in Homo and Heterogeneous Systems

研究了钕、钐、铕、铽、镥的乙酰丙酮化合物,铈、钕、钐、铕、铽、镝、钬、镥的水合氯化物及8-羟基喹啉化合物对环戊二烯与丙烯醛反应的立体化学影响,并比较了在均相反应和异相反应中这些稀土化合物对双烯合成产物的立体选择性的影响。

Abstract The diene synthesis of cyclopentadiene with actolen were catalyzed by lanthanide cornplexes such as LnCl3·6H2O(Ln=Nd,Sm,Eu,Tb,Dy,Ho,Lu), Ln(8-hydroxyquinolinate)3(Ln=Ce,Nd,Sm,Eu,Tb,Dy,Ho,Lu)and Ln(acac)3· 3H2O(Ln=Nd,Sm,Eu,Tb,Lu).Cyclopentadiene reacts with acrolein under the lanthanide cornplexes catalysjs in a higher stereoselectivity.The ratios of stereoiso- meric products were determined.For the diene synthesis of cyclopentadiene with acrolein the endo to exo ratios of adducts show higher values in the homogeneous cat- alyzed systems than in the heterogerleous one.