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Mario Glanz Sebastian Dechert Herbert Schumann Dietmar Wolff Dietmar Wolff Jürgen Springer 《无机化学与普通化学杂志》2000,626(12):2467-2477
The Influence of the Coordination Sphere of Samarocenes on the Synthesis of Liquid Crystalline Polymethacrylates (C5Me5)2Sm(THF)2 ( 1 ) reacts with 1,3‐Diisopropyl‐4,5‐dimethylimidazoline‐2‐ylidene C3N2Me2iPr2 (iPr‐carben) with formation of (C5Me5)2Sm(iPr‐carben) ( 3 ). The reaction of (C5Me4Et)2Sm(THF)2 ( 2 ) with Al2Me6 in toluene yields [(C5Me4Et)2Sm(CH3)Al(CH3)3]2 ( 6 ). 3 and 6 were characterized by single crystal X‐ray structure analysis. Via living polymerization of mesogenic methacrylates with the organosamarium complexes 1 , 2 , 3 , (C5Me5)2Sm(C3H5) ( 4 ), (C5Me5)2Sm(CH3)(THF) ( 5 ), 6 , and (C5Me4Et)2SmCH(SiMe3)2 ( 7 ), liquid crystalline homo‐ and blockcopolymers were obtained with narrow molecular mass distribution indexes in high yield. Partial competitive mechanisms are observed dependend of the structure of the catalyst and the polarity of the solvents. 相似文献
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近年来 ,有许多文献报道茂金属催化剂的负载化及其在烯烃聚合中的应用 ,这对发展新型茂金属催化剂和开发新型高分子材料有重要意义 [1,2 ] .我们 [3]曾报道壳聚糖负载稀土催化剂用于甲基丙烯酸甲酯的配位聚合有优良性能 .以五甲基环戊二烯为配体的有机稀土配合物 ,如 [Sm H( C5Me5) ]2 ,[C5Me5]Ln Me( THF) ( Ln=Sm,Yb)等在甲苯中单组分引发甲基丙烯酸甲酯聚合及内酯开环聚合具有许多优异性能[4 ,5] ,但是经负载化的该类催化剂的聚合性能尚未见报道 .本文报道将 [C5Me5]2 Sm Me·( THF)负载于二氧化硅 ,引发甲基丙烯酸甲酯聚合的结… 相似文献
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YUMing-xin ZHANGYong-min 《高等学校化学研究》2003,19(4):432-433
An organosamarium reagent was prepared via the reaction of a-bromoacetophenone with samarium. This organosamarium reagent reacted with aldehydes to give β-hydroxy ketones. A possible reaction process was suggested. 相似文献
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