作者:Andrea Mazzanti、Lodovico Lunazzi、Renzo Ruzziconi、Sara Spizzichino、Manfred Schlosser
DOI:10.1002/chem.200903372
日期:——
By making use of a novel diastereotopicity probe, namely C(CF3)2OH, it has been possible to measure by very low temperature 19F NMR spectroscopy the elusive aryl–aryl rotation barriers of biphenyls bearing an OH or F group in one ortho position. The experimental values (5.4 and 4.4 kcal mol−1, respectively) are matched by those from ab initio calculations (5.3 and 4.3 kcal mol−1, respectively).
通过使用一种新型的非对映异构性探针,即C(CF 3)2 OH,可以通过非常低的19 F NMR光谱测量一个邻位上带有OH或F基团的联苯的难以确定的芳基-芳基旋转势垒位置。实验值(分别为5.4和4.4 kcal mol -1)与从头计算(分别为5.3和4.3 kcal mol -1)相匹配。