- Synthesis, physicochemical and optical characterization of novel fluorescing complex: O-phenylenediamine-benzoin
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The complex of o-phenylenediamine (o-PDA) and benzoin (BN) was synthesized adopting solid state reaction by mixing of their melt together followed by chilling. The phase diagram study shows the formation of a complex in 1:1 molar ratio with congruent melt
- Dwivedi,Kant, Shiva,Rai,Rai
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Read Online
- Nano-BF3·SiO2: A reusable and eco-friendly catalyst for synthesis of quinoxalines
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2,3-Disubstituted quinoxalines were synthesized via condensation of α-diketones and 1,2-phenylenediamines. Nano-BF3·SiO 2 as a "green" and reusable solid acid was used as the catalyst for the synthesis of quinoxalines. The reaction was carried out at room temperature under sonication with high to excellent yields.
- Mirjalili,Bamoniri,Akbari
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experimental part
p. 487 - 491
(2012/01/13)
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- Synthesis and investigation of mass spectra of some nitrogen heterocycles
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2,3-DIPHENYL-1, 2-dihydro-quinoxaline (2), 2, 3-diphenyl-quinoxaline (3) and 2, 3-diphenyl-1, 2, 3, 4-tetrahydroquinoxaline (4) were prepared via the reaction of benzoin with o-phenylene diamine under different reaction conditions. Acylation of 2 and 4 with acetic anhydride yielded the corresponding N-acetyl (5) and N, N-1, 4-diacetyl derivative (7), respectively. Bromination of 2 with bromine gave the corresponding 6, 7-dibromo-2,3- diphenyl-quinoxaline (6). 2, 3, 5, 6-tetraphenylpyrazine (8) and 1-(benzylidene) amino-4, 5-diphenyl-1,5-dihydro-imidazoldine-2-thione (9) were synthesized by treatment of benzoin (1) with thiourea and benzaldehyde-thiosemicarbazone. The electron impact mass spectra of both of the above series of compounds have also been recorded and their fragmentation pattern is discussed.
- Hasanen,Ibrahim
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experimental part
p. 337 - 351
(2009/09/06)
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- The synthesis of quinoxalines by condensation reaction of acyleins with o-phenylenediamine without solvent under microwave irradiation
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A convenient synthetic method for 2,3-disubstituted quinoxalines is described. Heating the aryl or alkyl acyloins and o-phenylenediamine in a microwave oven for 3-6 minutes affords 2,3-disubstituted quinoxalines in 20-94% yields.
- Juncai, Feng,Yang, Liu,Qinghua, Meng,Bin, Liu
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p. 193 - 196
(2007/10/03)
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- Titanium(III) Chloride and Electrochemical Reduction of Pyrazine, Quinoxaline and Triazine Derivatives and of their Salts
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The reduction of pyrazine, quinoxaline and triazine derivatives by titanium(III) chloride leads to di- or tetrahydrogenated compounds.High yields of tetrahydro compounds are also obtained through the reduction of quinoxalinium salts.These results are comp
- Armand, J.,Chekir, K.,Pinson, J.
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p. 1237 - 1240
(2007/10/02)
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