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Authors = Abolfazl Olyaei

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4 pages, 79 KiB  
Short Note
2,2'-Thio-bis[(4-methylphenyl)-2-aminobenzoate]
by Mahdieh Sadeghpour, Abolfazl Olyaei and Mortaza Rezaei
Molbank 2012, 2012(2), M760; https://doi.org/10.3390/M760 - 15 Jun 2012
Viewed by 3563
Abstract
A novel symmetrical bisamine derivative (4) was synthesized by condensation reaction of 2,2'-thio-bis[4-methylphenol] (1) and isatoic anhydride in acetonitrile as solvent in the presence of K2CO3 under reflux conditions. The structure of the title compound was [...] Read more.
A novel symmetrical bisamine derivative (4) was synthesized by condensation reaction of 2,2'-thio-bis[4-methylphenol] (1) and isatoic anhydride in acetonitrile as solvent in the presence of K2CO3 under reflux conditions. The structure of the title compound was established on the basis of elemental analysis, FT-IR, 1H-NMR, 13C-NMR and mass spectral data. Full article
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8 pages, 120 KiB  
Article
Synthesis of New Unsymmetrical 4,5-Dihydroxy-2-imidazolidinones. Dynamic NMR Spectroscopic Study of the Prototropic Tautomerism in 1-(2-Benzimidazolyl)-3-phenyl-4,5-dihydroxy-2-imidazolidinone
by Mehdi Ghandi, Abolfazl Olyaei and Farshid Salimi
Molecules 2006, 11(10), 768-775; https://doi.org/10.3390/11100768 - 19 Oct 2006
Cited by 5 | Viewed by 10608
Abstract
The acid-catalyzed cyclocondensation in refluxing acetonitrile of aqueousglyoxal with N-heteroaryl-N'-phenylureas 4a-f (heteroaryl = 2-thiazolyl, 2-pyrimidinyl,2-pyrazinyl, 2-pyridinyl, 3-pyridinyl and 2-benzimidazolyl) led to the formation of thecorresponding 1-heteroaryl-3-phenyl-4,5-dihydroxy-2-imidazolidinones 5a-f. All theproducts were characterized by elemental and spectroscopic analyses. The free-energybarrier (∆GP≠ for prototropic tautomerism in [...] Read more.
The acid-catalyzed cyclocondensation in refluxing acetonitrile of aqueousglyoxal with N-heteroaryl-N'-phenylureas 4a-f (heteroaryl = 2-thiazolyl, 2-pyrimidinyl,2-pyrazinyl, 2-pyridinyl, 3-pyridinyl and 2-benzimidazolyl) led to the formation of thecorresponding 1-heteroaryl-3-phenyl-4,5-dihydroxy-2-imidazolidinones 5a-f. All theproducts were characterized by elemental and spectroscopic analyses. The free-energybarrier (∆GP≠ for prototropic tautomerism in 1-(2-benzimidazolyl)-3-phenyl-4,5-dihydroxy-2-imidazolidinone (5f) was determined by dynamic NMR studies to be 81 ± 2KJ molP-1 Full article
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8 pages, 56 KiB  
Article
Novel Reaction of N,N'-Bisarylmethanediamines with Formaldehyde. Synthesis of Some New 1,3,5-Triaryl-1,3,5-hexahydrotriazines
by Mehdi Ghandi, Farshid Salimi and Abolfazl Olyaei
Molecules 2006, 11(7), 556-563; https://doi.org/10.3390/11070556 - 26 Jul 2006
Cited by 12 | Viewed by 11059
Abstract
The acid-catalyzed cyclocondensation of N,N'-bisaryl (aryl = 2-pyrimidinyl, 2- pyrazinyl and 4-nitrophenyl) methanediamines 5a-c with aqueous formaldehyde in refluxing acetonitrile leads to the formation of the corresponding 1,3,5-triaryl-1,3,5-hexa- hydrotriazines 6a-c. The stoichiometric reactions of 2-aminopyrimidine and 2-amino- pyrazine with aqueous formaldehyde in acetonitrile [...] Read more.
The acid-catalyzed cyclocondensation of N,N'-bisaryl (aryl = 2-pyrimidinyl, 2- pyrazinyl and 4-nitrophenyl) methanediamines 5a-c with aqueous formaldehyde in refluxing acetonitrile leads to the formation of the corresponding 1,3,5-triaryl-1,3,5-hexa- hydrotriazines 6a-c. The stoichiometric reactions of 2-aminopyrimidine and 2-amino- pyrazine with aqueous formaldehyde in acetonitrile under reflux conditions also afforded 6a and 6b, respectively. Treatment of 2-aminopyrimidine with aqueous formaldehyde in a 3:2 ratio yielded N,N',N"-tris(2-pyrimidinyl)dimethylenetriamine (7a) as a sole product, which upon subsequent reaction with formaldehyde also afforded 6a. The reaction of N,N'-biphenylmethanediamine with formaldehyde was also investigated. Full article
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