An X-ray crystallographic, 1H nuclear magnetic resonance, and MNDO SCF-MO conformational study of o-substituted N-benzylbenzothiohydroxamic acids
作者:Ana M. Lobo、Sundaresan Prabhakar、M. Amelia Santos、Henry S. Rzepa、David J. Williams
DOI:10.1039/p29840001511
日期:——
An X-ray determination of the structure of N-benzyl-o-methoxybenzothiohydroxamic acid (1a) shows the compound to have the Z-configuration with an intramolecular OH ⋯ S hydrogen bond [2.822(3)Å]. The nitrogen centre is planar, and the C-aryl group is orthogonal to the CNOH plane. 1H and 13C n.m.r. studies suggest that in non-polar solvents o-substituted N-benzylbenzothiohydroxamic acids retain the Z-configuration
一个X的结构的射线测定Ñ苄基ø -methoxybenzothiohydroxamic酸(1A)表示的化合物为具有ž构型与分子内OH⋯小号氢键[2.822(3)]。氮中心是平面的,并且C-芳基与CNOH平面正交。1 H和13 C nmr研究表明,在非极性溶剂中,邻位取代的N-苄基苯并硫代异羟肟酸保持Z-构型,而在极性溶剂(例如二甲基亚砜或甲醇)中,E-异构体也存在。旋转芳基至(硫代)羰基碳–C单键的活化参数已通过非对映异构体N-苄基亚甲基质子对1 H AB四重态的可变温度线形分析进行了测量。将结果与MNDO SCF-MO计算的结果进行比较。