Atropisomers of Hindered Triarylisocyanurates: Structure, Conformation, Stereodynamics, and Absolute Configuration
作者:Lodovico Lunazzi、Michele Mancinelli、Andrea Mazzanti
DOI:10.1021/jo300192n
日期:2012.4.6
The syn and anti diastereoisomers of some 1,3,5-triarylisocyanurate derivatives were isolated and their configuration assigned by NOE experiments and by X-ray diffraction. The kinetics of the syn/anti interconversion were determined, and the experimental activation energies matched satisfactorily the values predicted by DFT computations. Low-temperature NMR spectra were employed to determine the rotation
分离了一些1,3,5-三芳基异氰脲酸酯衍生物的顺式和反非对映异构体,并通过NOE实验和X射线衍射确定了它们的构型。syn / anti的动力学确定了相互转换,并且实验活化能与DFT计算预测的值令人满意地匹配。低温NMR光谱用于确定N键合的无阻碍芳基取代基的旋转势垒:这些势垒也可以通过DFT计算令人满意地重现。对于外消旋非对映异构体,通过对映选择性HPLC分离了两种预期的对映异构体(阻转异构体),并通过电子和振动圆二色性光谱的DFT模拟建立了绝对构型。