Theoretical investigation of the conformation and hydrogen bonding ability of 5-arylazosalicylaldoximes

Highly Efficient Synthesis of New 2H-Chromene Dyes using Cu-SBA-15

“…In this research, 5-Phenylazo-salicylaldehyde 1 was synthesized similar to the repor ted methods 33,34 , but optimized, and also the mesoporous Cu-SBA-15 catalyst was prepared by literature 35 .…”

DFT and experimental determination of conformations of 2‐(ethoxycarbonylmethoxy)‐5‐(arylazo)benzaldehydes and their oximes

“…The remaining signals for the aromatic system in the 1 H and 13 C NMR spectra were assigned based on their positions, integrals and multiplicities and on comparison of these signals with those of arylazosalicylaldehydes and their oximes. [23] Scheme 1. Steps involved in the synthesis of aldehydes 1-4 and their oximes 5-8.…”

“…The configuration of azo double bond in compounds 1-8 is expected to be same as that of the parent arylazosalicylaldehydes and their oximes [E configuration] [23] because they are derived from arylazosalicylaldehydes only. However, the orientation of aldehydic and oxime moieties may differ from their parent compounds because intramolecular hydrogen bonding stabilizes the orientation of these moieties in the parent compounds and no such stabilization in compounds 1-8.…”

“…All NMR measurements were made on 5-mm NMR tubes. The spectral parameters for 1 H were as follows: spectral width, 5387.9-10330.6 Hz; acquisition time, 1.59-2.50 s; digital resolution, 0.2-0.4 Hz; and number of scans, [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. For 13 C, the spectral parameters were as follows: spectral width, 24038.5-30030.0 Hz; acquisition time, 0.50-0.68 s; digital resolution, 0.73-1.00 Hz; and number of scans, 1024-3382.…”

“…Recently, we have synthesized and determined the conformations of some 5-arylazosalicylaldehydes and their oximes by theoretical methods and spectral studies. [23] These aldehydes can be used as starting materials to synthesize several Schiff bases, which in turn can be used as colorimetric receptor for some ions. Further, these aldehydes and their oximes can be used to synthesize several coordination complexes, fused macrocycles, oxazolidines, pyrimidines and so on.…”