1-(Arylchloromethyl)pyridinium chlorides. Investigation by X-ray single crystal diffraction and semiempirical (PM3, AM1, MNDO) calculations
作者:Olga N. Kataeva、Igor A. Litvinov、Vladimir E. Kataev、Jean Jacques Vanden Eynde、Annie Mayence、Ernst Anders
DOI:10.1016/s0022-2860(97)00217-2
日期:1998.2
The molecular structures of 1-[chloro(2-methoxyphenyl)methyl]pyridinium chloride and 1-[chloro(3-nitrophenyl)methyl]-pyridinium chloride were studied by X-ray single crystal diffraction and semiempirical calculations (PM3, AM1, and MNDO) in comparison with model compounds to give a deeper insight into reactivity of these pyridinium salts. Feasibility of the nucleophilic substitution of the chlorine
摘要 通过 X 射线单晶衍射和半经验计算(PM3、AM1、和 MNDO) 与模型化合物进行比较,以更深入地了解这些吡啶盐的反应性。在这种阳离子中氯原子亲核取代的可行性在相对强的环外 NC 键中找到了解释,这抑制了吡啶环系统的取代。发现 PM3 足够准确,可以正确预测此类阳离子的结构。对于这两种阳离子,在晶相中观察到的非对称构象主要由外环 Cα 原子上的氯取代基决定。