Synthesis, Structure, and Hydroamination Kinetics of (2,2‘-Diaryldipyrrolylmethane)- and Bis(2-arylpyrrolyl)titanium Complexes
作者:Douglas L. Swartz、Aaron L. Odom
DOI:10.1021/om0607088
日期:2006.12.1
respectively. The solid-state structures of these complexes are quite similar to that of the sterically smaller 5,5-dimethyldipyrrolylmethane complex Ti(NMe2)2(dmpm) with one η5- and one η1-pyrrolyl; however, the substituted derivatives display much lower barriers to pyrrolyl conformational exchange, as judged by VT 1H NMR spectroscopy. Also synthesized were bis(pyrrolyl) complexes without the methylene connector
丙酮和2-芳基吡咯的三氟乙酸催化反应导致形成2,9-二芳基-5,5-二甲基二吡咯基甲烷。使用该方法制备了具有3,5-(CF 3)2 C 6 H 3(H 2 dmpm 3,5-CF 3)和异戊二烯(H 2 dmpm mes)芳烃的配体,其收率分别为72%和68%。新的二吡咯基甲烷与Ti(NMe 2)4反应形成Ti(NMe 2)2(dmpm 3,5-CF 3)和Ti(NMe 2)2(dmpm mes))分别以92%和30%的收益率提供。这些复合物的固态结构是非常相似的是,空间上较小的5,5- dimethyldipyrrolylmethane复杂的Ti(NME的2)2(DMPM)与一种η 5 -和一个η 1吡咯基; 然而,如通过VT 1 H NMR光谱所判断的,取代的衍生物对吡咯基构象交换显示出低得多的障碍。还合成了没有亚甲基连接基的双(吡咯基)配合物。芳基为3,5-(CF 3)2 C 6 H