Study on the structure–property relationship in a series of novel BF2 chelates with multicolor fluorescence
作者:Qi-Chao Yao、Ding-Er Wu、Ru-Zheng Ma、Min Xia
DOI:10.1016/j.jorganchem.2013.06.012
日期:2013.10
A series of multicolor fluorescent N,O-bidentate BF2 complexes with variable ligand structures have been synthesized. These complexes exhibit the solvent-independent optical properties and large Stoke shifts. The electrochemical measurements demonstrate that all these chelates are better electron acceptors than the commonly used material Alq3. A qualitative structure–property relationship among these
The Preparation of 3-Substituted-2(1H)-quinoxalinones by the Condensation of 3-Methyl-2-quinoxalinol Dianion with Certain Electrophilic Reagents
作者:Joanna G. Freeman-Davis、Margaret A. Hines、Cynthia L. Mazat-Griffith、Charles F. Beam
DOI:10.1080/00397919308009769
日期:1993.1
Abstract 3-Methyl-2-quinoxalinol dianion was prepared in an excess of lithium diisopropylamide (LDA), condensed with select aliphatic or aromatic esters, a carbamyl chloride, or aliphatic carboxylic acid anhydrides, and the resulting intermediates were quenched to afford new and known 3-substituted-2(1H)-quinoxalinones.
作者:V. A. Mamedov、A. M. Murtazina、A. T. Gubaidullin、E. A. Khafizova、I. Kh. Rizvanov、I. A. Litvinov
DOI:10.1007/s11172-010-0289-7
日期:2010.8
3-(2-aryl-2-oxoethylidene)-3,4-dihydroquinoxalin-2(1H)-ones with hydrazine hydrate (and phenylhydrazine), in boiling aceticacid undergo new acid-catalyzed rearrangement with the contraction of pyrazine ring of the quinoxaline system to form 2-(pyrazol-3-yl)benzimidazoles. Possible mechanisms of this rearrangement are considered.