OMe (5), Ph (7)] are presented and discussed. The spectra of 1 and 3−5 show that at low temperature two isomers are present in each case and that these isomers interconvert on the NMR time scale. The isomers are interpreted to occur because the p-N2C6H4OMe ligand adopts two different orientations where the aryl group is oriented syn to either the X or Y ligand in these chiral complexes of general formula
Cp * ReH(CO)(p -N 2 C 6 H 4 OMe)(1)和Cp * Re(CH 3)(CO)(p -N 2 C 6 H 4 OMe)的可变1 H NMR光谱(3)和Cp * ReCl(PR 3)(p -N 2 C 6 H 4 OMe)的可变温度31 P 1 H} NMR光谱[R = Me(4),OMe(5),Ph(7)]进行介绍和讨论。1的光谱和3 - 5表明,在低温下的两种异构体中存在的每一种情况下,这些异构体相互转化的NMR的时间尺度。解释出现这些异构体是因为p -N 2 C 6 H 4 OMe
配体采用两个不同的方向,其中在这些通式Cp * ReXY(p -N的手性络合物中,芳基与X或Y
配体同向取向2 C 6 H 4 OMe)。7中庞大的PPh 3
配体导致压倒性地倾向于仅与Cl基团同向取向,因此仅一种可观察到的异构体。这些中性络合物中芳基二氮杂基
配体的构象异构化的活化