Quinoxaline Research Papers - Academia.edu (original) (raw)
A simple, highly efficient and green procedure for the condensation of aryl and alkyl 1, 2-diamines with -diketones in the presence of different catalyst at room temperature is described. And the recycled catalyst was used for the next... more
A simple, highly efficient and green procedure for the condensation of aryl and alkyl 1, 2-diamines with -diketones in the presence of different catalyst at room temperature is described. And the recycled catalyst was used for the next run under identical reaction conditions. Using this method, quinoxaline derivatives as biologically interesting compounds are produced in high to excellent yields and short reaction times. Present synthesis complies with principle of Green chemistry. As part of current studies, we here in report efficient practical technique of sonication reaction (sonosynthesis). The overall progress of the reaction was monitored by TLC and characterized by IR and NMR. Compared with traditional methods, these methods are more convenient and reactions can be carried out in higher yield, shorter reaction time and milder conditions, without generation of pollution and safer to analyst. The synthesized 2, 3-diphenyle quinoxaline was confirmed by physical constant and spectroscopic studies. Low cost, reuse of worn catalyst and maximum efficiency are some advantages of this synthesis. Compared with traditional method, this method is more convenient and reactions can be carried out in higher yield, shorter reaction time and milder conditions, without generation of pollution and safer to analyst. From these features present methods can be correlated for safer and efficient synthesis of other products.
Hypervalent iodine(III)-induced oxidative [4+2] annulation of o-phenylenediamines and electron-deficient alkynes under metal-free conditions has been developed. The reaction allows for direct access to quinoxalines bearing two... more
Hypervalent iodine(III)-induced oxidative [4+2] annulation of o-phenylenediamines and electron-deficient alkynes under metal-free conditions has been developed. The reaction allows for direct access to quinoxalines bearing two electron-withdrawing groups in an efficient manner.
A broad spectrum of highly substituted, biologically interesting title compounds is prepared in water and absence of any catalyst via bromination of β-dicarbonyl compounds, followed by condensation of the resulting bromides with... more
A broad spectrum of highly substituted, biologically interesting title compounds is prepared in water and absence of any catalyst via bromination of β-dicarbonyl compounds, followed by condensation of the resulting bromides with phenylenediamines.
Two novel donor-acceptor (D-A)-type two-dimensional (2-D) polymers of PBDTSeQ (P1) and PBDTFQ (P2) were synthesized and characterized where 4,8-bis[5-(2-ethylhexyl) thiophen-2-yl] benzo[1,2-b:4,5-b'] dithiophene (BDT) was used as the... more
Two novel donor-acceptor (D-A)-type two-dimensional (2-D) polymers of PBDTSeQ (P1) and PBDTFQ (P2) were synthesized and characterized where 4,8-bis[5-(2-ethylhexyl) thiophen-2-yl] benzo[1,2-b:4,5-b'] dithiophene (BDT) was used as the donor unit. 2,3-Bis(3,4-bis(octyloxy)phenyl)-5,8-dibromoquinoxaline was used as the acceptor moiety and selenophene and furan were utilized as π bridges. Optoelectronic properties of the polymers were examined by electrochemical and spectroelectrochemical characterizations. In cyclic voltammetry (CV) studies, both polymers were found to be ambipolar. In anodic region, oxidation potentials were observed as 1.45 V and 1.15 V for P1 and P2 respectively, while reduction potentials were 0.65 V and 0.92 V. In cathodic region, redox potentials were found to be −1.36 V/−1.32 V and −2.0 V/−1.51 V for P1 and −1.45 V/ −1.05 V and −2.15 V/−1.45 V for P2. Both polymers showed good solubility in common solvents. The synthesized polymers were used as photoactive layers in solar cell devices. P1-based device (ITO/PEDOT:PSS/ P1:PC 71 BM (1:3, w/w)/LiF/Al) provided the best performance with a PCE of 4.04%, a V OC of 0.67 V, a J SC of 13.94 mA/cm 2 , and a FF of 43.3%.
A simple, highly efficient and green procedure for the condensation of o-phenylenediamine with α-diketones in the presence of catalytic quantity of phthalic acid(0.0083 g, 5mol%) at room temperature was done. Using this method,... more
A simple, highly efficient and green procedure for the condensation of o-phenylenediamine with α-diketones in the presence of catalytic quantity of phthalic acid(0.0083 g, 5mol%) at room temperature was done. Using this method, quinoxaline derivatives as biological fascinating compound are produced in good to excellent yields and short reaction times. Keywords:Quinoxaline, o-Phenylenediamine, α-Diketone, Phthalic acid, Green chemistry.
Monomeric and polymeric 5-nitroquinoxaline derivatives disubstituted in the 2 and 3 positions with 2-pyrrolyl (A), 2-furyl (B) and 2-thienyl (C) groups were prepared and characterized. The substituted 5-nitroquinoxalines were used as... more
Monomeric and polymeric 5-nitroquinoxaline derivatives disubstituted in the 2 and 3 positions with 2-pyrrolyl (A), 2-furyl (B) and 2-thienyl (C) groups were prepared and characterized. The substituted 5-nitroquinoxalines were used as active components in poly(vinyl chloride)-membrane and electropolymerized electrodes that were then tested as possible sensors for various cationic species. In contrast to the difurylnitroquinoxaline-based systems, the monomeric and polymeric dipyrrolyl- and dithienylquinoxaline electrodes displayed a good selectivity for Ag+ ions, providing a near-Nernstian response in the 10ч to 10ф mol Lу concentration range. The similar potentiometric behavior displayed by the monomeric and polymeric forms of systems A and C supports the contention that the main binding modes displayed by the monomeric forms are retained in the corresponding polymeric structures.