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NMR spectroscopy of 2-hydroxy-1-naphthylidene Schiff bases with chloro and hydroxy substituted aniline moiety

机译:含氯和羟基取代的苯胺基团的2-羟基-1-萘亚席夫碱的NMR光谱

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摘要

Schiff bases, products of the reaction of primary amines and carbonyl compounds, are involved in many metabolic processes. Hence, physicochemical studies of Schiff bases as model substances can contribute to a better understanding of biological systems. In this work, the one-and two-dimensional homo- and heteronuclear H-1 and C-13 NMR spectra of 2-hydroxy-1-naphthylidene Schiff bases with differently chloro- and hydroxyl- substituted aniline moiety were studied. The spectra were analyzed on the basis of chemical shifts, substituent effects, spinspin couplings as well as connectivities. It was established that the investigated Schiff bases exist as NH tautomers in DMSO-d(6) Solution with NH group orientated in cis position relative to the carbonyl of naphthylidene moiety. The positions of substituents on aniline ring were found to be in agreement with intra- and intermolecular hydrogen bond formation. Influence of substituents on planar or nonplanar conformation of compounds is discussed as well.
机译:Schiff碱是伯胺和羰基化合物反应的产物,参与许多代谢过程。因此,作为模型物质的席夫碱的物理化学研究可以有助于更好地理解生物系统。在这项工作中,研究了具有不同氯和羟基取代苯胺部分的2-羟基-1-萘亚席夫碱的一维和二维同核和异核H-1和C-13 NMR光谱。根据化学位移,取代基效应,自旋旋转偶联以及连接性对光谱进行了分析。已确定所研究的席夫碱以NH互变异构体的形式存在于DMSO-d(6)溶液中,其中NH基团相对于萘基部分的羰基位于顺式位置。发现苯胺环上的取代基的位置与分子内和分子间氢键的形成一致。还讨论了取代基对化合物的平面或非平面构象的影响。

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