Proton and carbon nuclear magnetic resonance study on some n- and o-acyl derivatives of monohydroxypyridines
作者:M.R. Del Giudice、G. Settimj、M. Delfini
DOI:10.1016/0040-4020(84)85087-5
日期:1984.1
Comparative study on the proton and carbon NMR spectra for a series of N- and O-acyl substituted monohydroxypyridines (C5H4NOR: R=-H, -CHO, -COCH3, -COC(CH3)3, -COCF3, -COC6H5, -SO2CH3, -SO2C6H4CH3 is reported. p]Characteristic 1H, 13 NMR and IR spectral features allow simple and unambiguous distinction between the isomeric N- and/or O-acyl-derivatives of 2-, 3- and 4-hydroxypyridines, so that both
一系列N和O-酰基取代的单羟基吡啶(C 5 H 4 NOR:R = -H,-CHO,-COCH 3,-COC(CH 3)3,-COCF的质子和碳NMR光谱的比较研究报道了3,-COC 6 H 5,-SO 2 CH 3,-SO 2 C 6 H 4 CH 3 [ p]特性1 H,13 NMR和IR光谱特征可对2-,3-和4-羟基吡啶的同分异构的N-和/或O-酰基衍生物进行简单而明确的区分,因此,由于互变异构,当互变异构发生平衡时,两种形式都可以清楚地鉴定出来。速度在NMR时间尺度上很慢
Spectroscopic and Crystallographic Characterization of the R<sub>3</sub>N<sup>+</sup>−C−H⋅⋅⋅X Interaction
作者:Joseph N. Capilato、Stefan A. Harry、Maxime A. Siegler、Thomas Lectka
DOI:10.1002/chem.202103922
日期:2022.2.7
Despite recent studies that have demonstrated the importance of R3N+−C−H hydrogenbonds in synthesis, biology and medicine, these noncovalent interactions remain undercharacterized. Herein, we present crystallographic, computational and for the first time, spectroscopicevidence for these weak hydrogenbonds.
尽管最近的研究证明了 R 3 N + -C-H 氢键在合成、生物学和医学中的重要性,但这些非共价相互作用仍未得到充分表征。在这里,我们首次展示了这些弱氢键的晶体学、计算学和光谱学证据。