15N, 13C and 1H NMR study of tautomerism and E/Z isomerism in 3-[(Z)-(2-phenylhydrazinylidene)methyl]quinoxalin-2(1H)-one and 3-[(E)-(2-phenylhydrazinylidene)methyl]quinoxalin-2(1H)-one
-
Add time:08/07/2019 Source:sciencedirect.com
The one- and two-dimensional 15N, 13C and 1H NMR spectra of benzenediazonium chloride coupling product with 3-methylquinoxalin-2(1H)-one were measured and analysed. It was convincingly proved that two components of the reaction product obtained by coupling reaction are 3-[(Z)-(2-phenylhydrazinylidene)methyl]quinoxalin-2(1H)-one ((Z)-1, major component) and 3-[(E)-(2-phenylhydrazinylidene)methyl]quinoxalin-2(1H)-one ((E)-1, minor component). Detailed analysis of 15N, 13C and 1H NMR spectra allowed to correct previously published incorrect data describing a tautomeric equilibrium between azo and hydrazo forms. Multinuclear and multidimensional NMR studies have been proven to be extremely effective in resolving the tautomeric forms of ‘azo’ dye systems.
We also recommend Trading Suppliers and Manufacturers of (E,Z)-2,13-OCTADECADIENOL (cas 123551-47-3). Pls Click Website Link as below: cas 123551-47-3 suppliers
Prev:Boiling of the new low-GWP refrigerants R1234ze(Z) and R1233zd(E) inside a small commercial brazed plate heat exchanger
Next:The role of distance between donor and acceptor in configuration stability of Z/E isomers based on cyanostilbene) - 【Back】【Close 】【Print】【Add to favorite 】
- Related Information
- Synthesis of new fluorinated synthons: (E and Z) ClFCCFI and (E and Z) BrFCCFI08/15/2019
- Roles of Polycomb group proteins Enhancer of zeste (E(z)) and Polycomb (Pc) during metamorphosis and larval leg regeneration in the flour beetle Tribolium castaneum08/14/2019
- Construction of Z-scheme Fe2O3@e-HNbWO6 composite and its enhanced photocatalytic activity08/13/2019
- Thermodynamic analysis of low GWP alternatives to HFC-245fa in high-temperature heat pumps: HCFO-1224yd(Z), HCFO-1233zd(E) and HFO-1336mzz(Z)08/12/2019
- Far UV peaks contribute for identification of carotenoids E/Z isomers08/11/2019
- Combined experimental and theoretical study of the novel ferrocene derivatives and examining the effect of E-Z stereoisomerism on their optical properties08/10/2019
- Simultaneous experimental comparison of low-GWP refrigerants as drop-in replacements to R245fa for Organic Rankine cycle application: R1234ze(Z), R1233zd(E), and R1336mzz(E)08/09/2019
- The role of distance between donor and acceptor in configuration stability of Z/E isomers based on cyanostilbene08/08/2019
- Boiling of the new low-GWP refrigerants R1234ze(Z) and R1233zd(E) inside a small commercial brazed plate heat exchanger08/06/2019
