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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of the Iranian Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Azo-hydrazone tautomerism,Solvatochromic dyes,5-Arylazobarbituric acids,Bifurcated intramolecular hydrogen bond
- چکیده:
- چکیده انگلیسی: The NMR spectra of azo dyes, 5-arylazobarbituric (5a-g), 5-arylazo-1,3-dimethylbarbituric
(6a-g) and 5-arylazothiobarbituric acids (7a-g) were studied in DMSO-d6 in different
concentrations. An intramolecular hydrogen bond was observed and indicating that the
hydrazone forms is mostly predominant. The peak of the hydrazone proton was severely
broadened and its chemical shift appeared at down field due to intramolecular hydrogen bond.
Existence of nitro group at ortho-position on phenyl ring caused the chemical shift value of the
proton of hydrazone form in 5a-7a to be more deshielded than other hydrazone protons in 5bg−
7b-g due to bifurcated intramolecular hydrogen bond and anisotropic ring-current effect. Dyes
6 shows two tautomers in NMR time scale at low concentration in DMSO-d6.- انتشار مقاله: 21-10-1387
- نویسندگان: Nader Noroozi Pesyan,Jabbar Khalafy,Karim Akbari Dilmaghani,,Saeed Rastgar,,Zahra Malekpoor,,Mina Mohammadzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Chemical Reviews
- نوع مقاله: Journal Article
- کلمات کلیدی: Multicomponent reactions,Arylglyoxals,Pyrrolo[2,3-d]pyrimidines,Enamines
- چکیده:
- چکیده انگلیسی: This review provides an overview of the recent literature on application of arylglyoxals the synthesis of pyrrolo[2,3-d]pyrimidines via multicomponent reactions in the period of 2008–2018. 1,2-Dicarbonyl compounds are attractive precursors for synthesis of various heterocyclic compounds, and arylglyoxals are frequently applied in synthesis of various organic compounds, and in particular of pyrrolo[2,3-d]pyrimidines derivatives, which are important due to their biological and pharmaceutical activities.
- انتشار مقاله: 27-04-1398
- نویسندگان: Ramin Javahershenas,Jabbar Khalafy,Rolf Herman Prager
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Malononitrile,Multicomponent reaction,Microwaves,Arylglyoxals,1-Naphthol,Mg-Al hydrotalcite,4H-benzo[h]chromenes
- چکیده:
- چکیده انگلیسی: Multicomponent condensation of 1-naphthol, malononitrile, and arylglyoxals in the presence of Mg-Al hydrotalcite under solvent-free MicroWave (MW) conditions gave a new series of 2-amino-4-aroyl-4H-benzo[h]chromene-3-carbonitriles in high yields (70-89%). The structure of all products was elucidated by their FT-IR, 1H-NMR, 13C-NMR spectral data and microanalysis.
- انتشار مقاله: 16-12-1396
- نویسندگان: Ahmad Poursattar Marjani,Jabbar Khalafy,Paria Eslamipour,Mehdi Ahmadi Sabegh
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Microwave Irradiation,One-pot multi-component reaction,ammonium acetate,dimedone,Acridinediones,Arylglyoxals
- چکیده:
- چکیده انگلیسی: A new and improved protocol for the synthesis, in good to excellent yields, of acridine-1,8(2H,5H)-diones is described, involving a one-pot, three component reaction of dimedone, arylglyoxals, and ammonium acetate in water under microwave irradiation.
- انتشار مقاله: 23-12-1394
- نویسندگان: Ahmad Poursattar Marjani,Jabbar Khalafy,Mohyeddin Chitan,Sahar Mahmoodi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Anthralin,Dithranol,Psoriasis,Anthrones,Thioanthralins,Sulfonylanthralins
- چکیده:
- چکیده انگلیسی: Treatment of 10-bromoanthralin (1) with several thiophenols (2) gave the corresponding 10-arylthioanthralins (3) in high yields. Oxidation of thioanthralins (3a-c) and (3k-m) using an excess of m-chloroperbenzoic acid gave the corresponding sulfones (4a-c) and (4k-m) in good yields. Oxidation of thioanthralins (3d-f) gave a mixture of the corresponding sulfones (4d-f) and anthralin-10,10'-dehydrodimer (5). Oxidation of thioanthralins (3g-j) afforded only anthralin-10,10'-dehydrodimer (5) with no evidence of sulfone.
- انتشار مقاله: 19-09-1373
- نویسندگان: Jabbar Khalafy,John Malcolm Pruce
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Dye removal,Congo red,MWCNT,Melamine,Schiff-base
- چکیده:
- چکیده انگلیسی: Carbon nanotubes (CNTs) have been extensively explored for adsorption applications due to their well-defined cylindrical hollow structure, large surface area, high aspect ratios, hydrophobic wall, and easily modified surfaces. In the present work, a poly Schiff-base was synthesized with capability to remove the dye pollutant from aqueous solutions. For this propose, firstly, multi-walled carbon nanotube (MWCNT) was modified with melamine, then the melamine-modified MWCNT was further reacted with 3-pyridinecarboxaldehyde to synthesize the final poly Schiff-base. The prepared adsorbent was employed to assess the removal of the dye pollutants from aqueous solutions and Congo red (CR) was selected as typical dye. Different adsorption parameters such as pH, adsorbent amount, initial concentration of the dye, and contact time were investigated and optimized. By adjusting these parameters, the adsorption percentage reached to the value of 92%. Moreover, the adsorption isotherms were studied and fitted with the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) models. The kinetic studies were carried out by using the Lagergren pseudo-first-order and the Ho pseudo-second-order equations. The adsorbent was also characterized by FT-IR, TGA, and SEM techniques.
- انتشار مقاله: 09-05-1398
- نویسندگان: Somayeh Farajzadeh,Peyman Najafi Moghadam,Jabbar Khalafy
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: β-Aminocrotonitrile Arylglyoxal 1,3-Dimethylbarbituric acid Thiobarbituric acid TEA (triethylamine)
- چکیده:
- چکیده انگلیسی: A green approach to synthesis of the polyfunctionalized pyrazole [4′,3′:5,6]pyrido[2,3-d] pyrimidines derivatives was successfully achieved via one-pot, four component reactions of β-aminocrotonitrile, phenyhydrazine, arylglyoxals, barbituric acid derivatives in the presence of TEA (Triethylamine) as a catalyst in water under the reflux conditions. This protocol provided mild reaction conditions, short reaction times, high yields, low cost, easy isolation of products and possible biological, and pharmaceutical activities.
- انتشار مقاله: 15-12-1396
- نویسندگان: Ramin Javahershenas,Jabbar Khalafy
- مشاهده