Location effect of an OH group on the chemiluminescence efficiency of 4-hydroperoxy-2-(o-, m-, or p-hydroxyphenyl)-4,5-diphenyl-4H-isoimidazoles
摘要:
In studying the location effect of an OH group on the chemiluminescence efficiency of 4-hydroperoxy-2-(o-, m-, or p-hydroxyphenyl)-4,5-diphenyl-4H-isoimidazoles 4, we found that the efficiency of 4a with o-OH was 0.28 times that of lophine peroxide on initiation with KOH/MeOH. When the trigger base was changed to TBAF/THF, efficiency was 530-fold in dry DMF. The efficiency of 4b with m-OH or 4c with p-OH showed no such dramatic change. (C) 2005 Elsevier Ltd. All rights reserved.
Zinc (II) [tetra(4-methylphenyl)] Porphyrin: a Novel and Reusable Catalyst for Efficient Synthesis of 2,4,5-trisubstituted Imidazoles Under Ultrasound Irradiation
An efficient three-component one-step synthesis of 2,4,5-trisubstituted imidazoles by condensation reaction of 1,2-diketones or α-hydroxyketones with aromatic aldehydes and ammonium acetate using Zinc (II) (tetra (4-methylphenyl)) porphyrin as a novel and reusable catalyst under ultrasound irradiation at ambient temperature is described. In this method, α-hydroxyketones as well as 1,2-diketones were
One-pot synthesis of 2,4,5-trisubstituted imidazole derivatives catalyzed by btppc under solvent-free conditions
作者:M. Alikarami、M. Amozad
DOI:10.4314/bcse.v31i1.16
日期:——
one-pot synthesis of lophine derivatives (2,4,5-trisubstituted imidazoles) by using the benzyltriphenylphosphonium chloride (BTPPC), as a catalyst, under solvent-free conditions is described. BTPPC is an available and inexpensive catalyst; also, it can be easily supplied. This procedure led to the corresponding 2,4,5-trisubstituted imidazoles products in high yields. KEY WORDS : Lophine derivatives, BTPPC
Green Synthesis of 1,2,4,5-Tetrasubstituted and 2,4,5-Trisubstituted Imidazole Derivatives Involving One-pot Multicomponent Reaction
作者:Ravi Bansal、Pradeep K. Soni、Anand K. Halve
DOI:10.1002/jhet.3160
日期:2018.6
Sodium lauryl sulfate has been found convenient, versatile, and eco‐friendly catalyst for the synthesis of 1,2,4,5‐tetrasubstituted and 2,4,5‐trisubstituted imidazole derivatives by one‐pot multicomponent reactions at 80°C using water as solvent. This protocol afforded advantages, that is, the metal‐free reaction, purification of products by non‐chromatographic method, and excellent yields.
Abstract Lophine (2,4,5-triphenylimidazole) derivatives were synthesized and their physicochemical properties were determined. Spectroscopic and fluorescence behavior of lophinederivatives in methanol at different pH and various solvents were presented. The observed spectroscopic features in the solution are determined by specific interactions of the NH hydrogen. These kinds of interactions are manifested
Homoselective synthesis of 5‐substituted 1
<i>H</i>
‐tetrazoles and one‐pot synthesis of 2,4,5‐trisubstuted imidazole compounds using BNPs@SiO
<sub>2</sub>
‐TPPTSA as a stable and new reusable nanocatalyst
scanning electron microscopy (SEM), X‐ray diffraction (XRD), energy dispersive X‐ray analysis (EDX), thermal gravimetric‐differentialthermalanalysis (TGA‐DTA), mapping, pH analysis, and Fourier transform infrared (FT‐IR) techniques. Furthermore, the catalyst recycled for at least sequential five loads without a remarkable drop‐in catalytic activity.