Substituent effects and stereochemistry in125Te NMR spectroscopy. Diorganyltellurium dihalides and some tellurides and ditellurides
作者:Helmut Duddeck、Armin Biallaβ
DOI:10.1002/mrc.1260320509
日期:1994.4
125Te, 19F and 13C NMR data for 33 compounds containing tellurium substituents are presented. The 125Te chemical shifts in (PhTeCl2)R compounds are between δ = 878 and 1023; in corresponding (PhTeF2)R compounds they are 220 to 360 ppm larger. Effects of substituents and conformational interconversions (dynamic 125Te NMR) are discussed. Several diastereomers were identified in (PhTeCl2)R derivatives
提供了 33 种含有碲取代基的化合物的 125Te、19F 和 13C NMR 数据。(PhTeCl2)R 化合物中的 125Te 化学位移介于 δ = 878 和 1023 之间;在相应的 (PhTeF2)R 化合物中,它们要大 220 到 360 ppm。讨论了取代基和构象互变(动态 125 Te NMR)的影响。在 (PhTeCl2)R 衍生物中发现了几种非对映异构体,它们在室温下是稳定的,并且碲原子的构型不同(受限制的假旋转)。结果表明,125Te 是非常适合手性识别的核。