【摘 要】
:
双(2,4-二叔丁基戊二烯基)镧系金属化合物(η5-Pdl′)2Yb(THF)(1)和(η5-Pdl′)2Sm(DME)(2)可以经Ln I2和2,4-二叔丁基戊二烯基钾(K(Pdl′))由置换反应制得。K(Pdl′)和Ln Cl
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双(2,4-二叔丁基戊二烯基)镧系金属化合物(η5-Pdl′)2Yb(THF)(1)和(η5-Pdl′)2Sm(DME)(2)可以经Ln I2和2,4-二叔丁基戊二烯基钾(K(Pdl′))由置换反应制得。K(Pdl′)和Ln Cl3发生氧化还原反应也能够得到化合物1和2。对2个化合物进行了表征。X射线单晶衍射结果显示,2个化合物中Pdl′基都是以η5模式配位到金属上。2个化合物都能够在室温下引发己内酯聚合并表现出高活性,得到分子量分布窄的聚己内酯。
(Η5-Pdl ’) 2Yb (THF) (1) and (η5-Pdl’) 2Sm (DME) (2) can be synthesized via Ln I2 And potassium 2,4-di-tert-butylpentadienylidene (K (Pdl ’)) by a displacement reaction. Redox reactions of K (Pdl ’) and Ln Cl3 can also afford compounds 1 and 2. Two compounds were characterized. X-ray single crystal diffraction results show that Pdl ’groups in both compounds are coordinated to the metal in the η5 mode. Both compounds were able to initiate caprolactone polymerization and exhibit high activity at room temperature, yielding polycaprolactones with narrow molecular weight distribution.
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