The synthesis, molecular structure, FT-IR and XRD spectroscopic investigation of 4-[(2-{[(2-furylmethyl)imino]methyl}-4-methoxyphenoxy)methyl]benzonitrile: A comparative DFT study
Abstract 4-[(2-[(2-Furylmethyl)imino]methyl}-4-methoxyphenoxy)methyl]benzonitrile, a novel Schiff base compound, was prepared for the first time and its structural and vibrational properties were studied both experimentally and theoretically using FT-IR and XRD spectroscopic methods. FT-IR spectrum was recorded in the region of 4000–400 cm −1 . The optimized geometric structures concerning to the
A series of benzyloxybenzaldehyde derivatives (1-4) were synthesized by the reactions of 4-(bromomethyl)benzonitrile with 4-hydroxy-3-methoxybenzaldehyde (vanillin), 2-hydroxy-3-methoxybenzaldehyde (o-vanillin), 2-hydroxy-4-methoxybenzaldehyde and 2-hydroxy-5-methoxybenzaldehyde. Condensation reactions among the new benzyloxybenzaldehyde derivatives (1-4) with 4'-aminobenzo-15-crown-5 yielded the new Schiff base compounds (5-8). Sodium complexes (5a-8a) and potassium complexes (5b-8b) were prepared with NaClO4 and KI, respectively. All of these synthesized compounds were characterized on the basis of FT-IR, H-1 and C-13 NMR, mass spectrometry and elemental analyses data. The solid state structures of compounds 8 and 5a were determined by X-ray crystallography. The extraction abilities of compounds 5-8 were also evaluated in CH2Cl2 by using several main group and transition metal picrates, such as Na+, K+, Pb2+, Cr3+, Ni2+, Cu2+ and Zn2+. (C) 2011 Elsevier Ltd. All rights reserved.
Stereochemical Inversion of Rim-Differentiated Pillar[5]arene Molecular Swings
作者:Ke Du、Paul Demay-Drouhard、Kushal Samanta、Shunshun Li、Tushar Ulhas Thikekar、Haiying Wang、Minjie Guo、Barend van Lagen、Han Zuilhof、Andrew C.-H. Sue
DOI:10.1021/acs.joc.0c01464
日期:2020.9.4
To investigate the dynamic stereochemical inversion behavior of pillar[5]arenes (P[5]s) in more detail, we synthesized a series of novel rim-differentiated P[5]s with various substituents and examined their rapid rotations by variable-temperature NMR (203–298 K). These studies revealed for the first time the barrier of “methyl-through-the-annulus” rotation (ΔG‡ = 47.4 kJ·mol–1 in acetone) and indicated