resonance (NMR). Upon activation with triisobutyl aluminum modified methylalumoxane (MMAO), the [OSNO]-type titanium complexes can polymerize styrene into syndiotactic polystyrene (sPS) with high syndiotacticity (rrr > 95%). Electron paramagnetic resonance (EPR) analysis on [OSNO]-type titanium (IV) complexes in the presence of MMAO in toluene revealed that cationic titanium (III) complexes are the active
[Ti(OC 6 H 2 -6- t Bu-4- t Bu)2 [CH N(CH 2)的两个C 1对称[OSNO]型乙二氧基桥联的
亚胺-
硫代双(
酚盐)
钛(IV)络合物)2 SCH 2 } Cl 2 ]和[Ti(OC 6 H 2 -6- t Bu-4- t Bu)2 CH N(CH 2)2 S} Cl 2 ]的合成是通过与相应的乙二基桥接的
亚胺基
硫代双(
酚)[(HOC 6 H 2 -6-t Bu-4- t Bu) 2 CHN(CH 2) 2 SCH 2 }]和[(HOC 6 H 2 -6- t Bu-4- t Bu) 2 CHN(CH 2) 2 S} ]与
钛前体TiCl 4。所得的配合物和中间体通过元素分析(EA)和核磁共振(NMR)进行表征。在与
三异丁基铝改性的甲基(
MMAO),则[OSNO]型
钛配合物可以聚合
苯乙烯到间规聚
苯乙烯(激活小号PS),具有较高的间同规整度(rrr> 95