فهرست مطالب
Journal of Chemical Reactivity and Synthesis
Volume:1 Issue: 3, Summer 2011
- تاریخ انتشار: 1390/04/21
- تعداد عناوین: 8
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Pages 1-11In this paper,N-(2-Fluorophenyl)-2,6-dimethyl-1,3-dioxan-4-amine (C12H16FNO2) optimized geometries and frequencies of the stationary point and energies in the ground state using DFT (B3LYP) methods with 6-311Gbasis set. The calculated HOMO and LUMO energies also confirmed that the charge transfer occurred within the molecule. Bond length and bond angles values forC12H16FNO2 were calculated by using B3LYP/ 6-311G.Keywords: C12H16FNO2, Dioxan, DFT, HOMO, LOMO
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Pages 12-161,4-bis(triphenylphosphonium)-2-butene dichloride was developed as a new phase transfer catalyst. This quaternized phosphonium salt catalyzed the regioselective ring opening of epoxides by thiocyanate ion to give β-hydroxy thiocyanates in high yields under mild conditions.Keywords: 4-bis(triphenylphosphonium)-2-butene dichloride, Phase transfer catalyst, β-hydroxy thiocyanates, epoxides
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Pages 17-22The condensation of aromatic aldehydes, dimedone, ethylacetoacetate and ammonium acetate promoted by was Phosphorus pentoxide supported on alumina carried out under solvent-free conditions to afford corresponding polyhydroquinolinederivatives. This method provides several advantages including high yields, low reaction times, easy work up and little catalyst loading.Keywords: Polyhydroquinoline, Solvent-free, Multicomponent reactions, Phosphorus pentoxide supported on alumina
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Pages 22-34A novel magnetically immobilized polyethyleneimine (PEI) fabricated by covalently anchoring on silica coated Fe3O4 nanoparticles (PEI@Si-MNPs) was prepared. The synthesized catalyst was characterized by Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). The immobilized PEI was shown to be an efficient heterogeneous catalyst for the synthesis of spiro-oxindole, benzopyranes and chromene derivatives via multi-component reaction (MCR), in water as a green solvent. The catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activityKeywords: Polyethyleneimine (PEI), Magnetic Nanoparticle, benzopyranes, Surface functionalization
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Pages 35-39A new and efficient synthesis of benzoxanthene drivatives from the three-component condensation reaction ofaryl aldehydes and β-naphthol under solvent-free conditions in the presence of β-cyclodextrin sulfonic acid, as an efficient heterogeneous solid acid catalyst with excellent yields and short reaction time is presentedKeywords: benzoxanthene, β-cyclodextrain sulfonic acid, Solvent-free conditions, β-naphthol, Aryl aldehydes
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Pages 40-44The reaction of stoichiometric amounts of dialkyl acetylenedicarboxylates with alkyl isocyanides and 5,5-diaryl thiohydantoins in toluene and catalytic amount of p-TSA afforded imidazo[2,1-b][1,3]thiazines in good overall yieldsKeywords: Thiohydantoin, Imidazo[2, 1-b][1, 3]thiazine, isocyanide, Acetylenedicarboxylate, Zwitterionic
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Pages 45-48The reactive intermediate generated by the addition of tert-butyl and 1,1,3,3-tetramethyl butyl isocyanide and cyclohexyl isocyanide to dialkyl acetylenedicarboxylate was trapped by 3-hydroxy pyridine to produce highly functionalized 4H-chromenes in fairly good yieldsKeywords: 3-hydroxy pyridine, dialkyl acetylene dicarboxylates, Alkyl isocyanide, multi component reaction, 4H-chromenes
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A green and efficient method for the preparation of 3, 4-dihydropyrimidin-2(1H)-ones using quaternary ammonium- treated clay in waterPages 49-56The reactive intermediate generated by the addition of tert-butyl and 1,1,3,3-tetramethyl butyl isocyanide and cyclohexyl isocyanide to dialkyl acetylenedicarboxylate was trapped by 3-hydroxy pyridine to produce highly functionalized 4H-chromenes in fairly good yieldsKeywords: organoclay, 4-Dihydropyrimidin-2(1H)-ones, Multicomponent reactions, Biginelli reaction