The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hossein Eshghi - One of the best experts on this subject based on the ideXlab platform.
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efficient solvent free synthesis of 12 aryl 8 9 10 12 tetrahydrobenzo a xanthen 11 ones and 3h spiro isobenzofuran 1 9 xanthen 3 one derivatives using cobalt Hydrogensulfate as a green heterogeneous and reusable catalyst
Organic Chemistry Research, 2016Co-Authors: Hossein Eshghi, Mohammad Rahimizadeh, Melika Eftekhar, M Hassanpour, Mehdi BakavoliAbstract:Cobalt Hydrogensulfate is an efficient catalyst for the condensation of β-naphthol, aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione at 120 °C to afford 9,9-dimethyl-12-phenyl-8,10,11,12-tetrahydro-9-H-benzo[a]xanthen-11-one derivatives in high yields. Also, polycondensation reactions of phenols with phthalic anhydride were carried out in the presence of cobalt hydrogensulphate under solvent-free conditions. Simple and convenient procedure, high conversion, reusability of catalyst, easy purification and short reaction time are the advantageous features of this method.
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diastereoselective three component mannich reaction catalyzed by silica supported ferric Hydrogensulfate
ChemInform, 2013Co-Authors: Hossein Eshghi, Mohammad Rahimizadeh, Mohsen Hosseini, Aida JavadiansarafAbstract:Optimum reaction conditions are examined for the diastereoselective three-component Mannich reaction catalyzed by silica-supported ferric Hydrogensulfate.
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diastereoselective three component mannich reaction catalyzed by silica supported ferric Hydrogensulfate
Monatshefte Fur Chemie, 2013Co-Authors: Hossein Eshghi, Mohammad Rahimizadeh, Mohsen Hosseini, Aida JavadiansarafAbstract:A highly anti-diastereoselective three-component Mannich reaction of aromatic amines and aromatic aldehydes with cyclohexanone in the presence of silica-supported ferric Hydrogensulfate has been developed. The best selectivity was obtained where there were electron-donating groups on both aldehyde and amine. Selectivity decreases when electron-withdrawing groups are present on the aldehyde; in these cases selectivity is improved if an electron-donating group is present on the amine.
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fe hso4 3 as an efficient catalyst for diazotization and diazo coupling reactions
Journal of The Korean Chemical Society, 2012Co-Authors: Mohammad Rahimizadeh, Hossein Eshghi, Ali Shiri, Zohreh Ghadamyari, Maryam Moghaddam Matin, Fatemeh Oroojalian, Parvaneh PordeliAbstract:Diazo coupling reactions of aromatic amines with 2-naphthol in a green, efficient and easy procedure is described. Ferric Hydrogensulfate catalyses this reaction in water at room temperature and short reaction time with high yields. The antibacterial activities of the synthesized compounds against four pathogenic bacteria are also investigated.
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synthesis of novel thioamidoalkyl and thiocarbamidoalkyl naphthols via a three component condensation reaction using heterogeneous catalyst of ferric Hydrogensulfate
ChemInform, 2012Co-Authors: Hossein Eshghi, Gholamhossein Zohuri, Saman DamavandiAbstract:Abstract Ferric Hydrogensulfate [Fe(HSO4)3] was used as a suitable heterogeneous catalyst for the one-pot multicomponent reaction of β-naphthol, aromatic aldehydes, and thioamide derivatives to obtain the corresponding thioamidoalkyl naphthols. Various novel thioamidoalkyl naphthols and thiocarbamidoalkyl naphthols were synthesized in good yields from thioacetamide and thiourea. The heterogeneous nature of the catalyst made it reusable for further chemical reactions.
Majid Ghashang - One of the best experts on this subject based on the ideXlab platform.
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magnesium Hydrogensulfate mg hso4 2 as an efficient catalyst for the preparation of silyl ethers dibenzo a j xanthenes and octahydroxanthene derivatives
Phosphorus Sulfur and Silicon and The Related Elements, 2009Co-Authors: Hamid Reza Shaterian, Fahimeh Khorami, Doust R Mohammadi, Majid GhashangAbstract:Magnesium Hydrogensulfate [Mg(HSO4)2], as a heterogeneous solid acid catalyst, has been used for the mild formation of trimethylsilyl (TMS) ethers from various primary, secondary, and tertiary aliphatic alcohols; aromatic alcohols; and oximes using hexamethyldisilazane (HMDS) under ambient conditions. In addition, 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydroxanthene derivatives were synthesized in the presence of Mg(HSO4)2 with short reaction times in high to excellent yield under solvent-free conditions.
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a facile and efficient trimethylsilylation of hydroxyl groups using silica supported zinc chloride and alumina supported sodium Hydrogensulfate as recyclable heterogeneous catalysts
Phosphorus Sulfur and Silicon and The Related Elements, 2009Co-Authors: Hamid Reza Shaterian, Fahimeh Khorami, Razieh Doostmohammadi, Azita Amirzadeh, Majid GhashangAbstract:Silica-supported zinc chloride (SiO2-ZnCl2) and novel alumina-supported sodium Hydrogensulfate (NaHSO4-Al2O3) as recyclable heterogeneous catalysts have been used for the mild trimethylsilylation of hydroxyl groups under ambient conditions. This procedure also allows for the selective protection of primary and secondary alcohols in the presence of tertiary alcohols.
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one pot preparation of β amido ketones esters in a three component condensation reaction using magnesium Hydrogensulfate as an effective and reusable catalyst
ChemInform, 2008Co-Authors: Hamid Reza Shaterian, Asghar Hosseinian, Majid GhashangAbstract:A one-pot, three-component condensation of an aryl aldehyde, an enolizable ketone or β-keto ester, acetyl chloride, and acetonitrile or benzonitrile in the presence of magnesium Hydrogensulfate as ...
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chemoselective dithioacetalization of carbonyl compounds using magnesium Hydrogensulfate as efficient heterogeneous catalyst
Phosphorus Sulfur and Silicon and The Related Elements, 2008Co-Authors: Hamid Reza Shaterian, Asghar Hosseinian, Majid Ghashang, Fahimeh KhoramiAbstract:Carbonyl compounds have been successfully converted into their corresponding dithiolanes and dithianes derivatives with 1,2-ethanedithiol and 1,3-propanedithiol in excellent yield at room temperature and short reaction times using a catalytic amount of magnesium Hydrogensulfate. The synthetic simple procedures reported in this paper constitute an exceptionally mild procedure for carbonyl protection in ambient conditions.
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ferric Hydrogensulfate as effective and recyclable catalyst for mild dithioacetalization of aldehydes and ketones
Phosphorus Sulfur and Silicon and The Related Elements, 2008Co-Authors: Hamid Reza Shaterian, Majid Ghashang, Razieh Doostmohammadi, Hamid Reza Ahmadian, Hossein YarahmadiAbstract:Ferric Hydrogensulfate has been found to be an extremely efficient and recyclable heterogeneous catalyst for dithioacetalization reactions. Carbonyl compounds have been successfully converted into their corresponding dithiolanes and dithianes derivatives in excellent yields at ambient conditions. The synthetic simple procedures reported in this paper constitute an exceptionally mild procedure for selective carbonyl protection.
Hamid Reza Shaterian - One of the best experts on this subject based on the ideXlab platform.
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magnesium Hydrogensulfate mg hso4 2 as an efficient catalyst for the preparation of silyl ethers dibenzo a j xanthenes and octahydroxanthene derivatives
Phosphorus Sulfur and Silicon and The Related Elements, 2009Co-Authors: Hamid Reza Shaterian, Fahimeh Khorami, Doust R Mohammadi, Majid GhashangAbstract:Magnesium Hydrogensulfate [Mg(HSO4)2], as a heterogeneous solid acid catalyst, has been used for the mild formation of trimethylsilyl (TMS) ethers from various primary, secondary, and tertiary aliphatic alcohols; aromatic alcohols; and oximes using hexamethyldisilazane (HMDS) under ambient conditions. In addition, 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydroxanthene derivatives were synthesized in the presence of Mg(HSO4)2 with short reaction times in high to excellent yield under solvent-free conditions.
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zinc Hydrogensulfate as an efficient catalyst for preparation of β amido carbonyl compounds
Chinese Journal of Chemistry, 2009Co-Authors: Hamid Reza Shaterian, Asghar HosseinianAbstract:A one-pot and efficient three-component condensation of benzaldehyde derivatives, enolizable ketones or ketoesters, acetyl chloride, and acetonitrile or benzonitrile under ambient conditions in the presence of zinc Hydrogensulfate for the synthesis of β-amido carbonyl compounds is described. The simple experimental procedure, high to excellent yields of products and preparation of diastereoselective β-acetamido ketoesters are strong features of the presented method.
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a facile and efficient trimethylsilylation of hydroxyl groups using silica supported zinc chloride and alumina supported sodium Hydrogensulfate as recyclable heterogeneous catalysts
Phosphorus Sulfur and Silicon and The Related Elements, 2009Co-Authors: Hamid Reza Shaterian, Fahimeh Khorami, Razieh Doostmohammadi, Azita Amirzadeh, Majid GhashangAbstract:Silica-supported zinc chloride (SiO2-ZnCl2) and novel alumina-supported sodium Hydrogensulfate (NaHSO4-Al2O3) as recyclable heterogeneous catalysts have been used for the mild trimethylsilylation of hydroxyl groups under ambient conditions. This procedure also allows for the selective protection of primary and secondary alcohols in the presence of tertiary alcohols.
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one pot preparation of β amido ketones esters in a three component condensation reaction using magnesium Hydrogensulfate as an effective and reusable catalyst
ChemInform, 2008Co-Authors: Hamid Reza Shaterian, Asghar Hosseinian, Majid GhashangAbstract:A one-pot, three-component condensation of an aryl aldehyde, an enolizable ketone or β-keto ester, acetyl chloride, and acetonitrile or benzonitrile in the presence of magnesium Hydrogensulfate as ...
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chemoselective dithioacetalization of carbonyl compounds using magnesium Hydrogensulfate as efficient heterogeneous catalyst
Phosphorus Sulfur and Silicon and The Related Elements, 2008Co-Authors: Hamid Reza Shaterian, Asghar Hosseinian, Majid Ghashang, Fahimeh KhoramiAbstract:Carbonyl compounds have been successfully converted into their corresponding dithiolanes and dithianes derivatives with 1,2-ethanedithiol and 1,3-propanedithiol in excellent yield at room temperature and short reaction times using a catalytic amount of magnesium Hydrogensulfate. The synthetic simple procedures reported in this paper constitute an exceptionally mild procedure for carbonyl protection in ambient conditions.
Nader Ghaffari Khaligh - One of the best experts on this subject based on the ideXlab platform.
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1 1 butylenebis 3 sulfo 3 h imidazol 1 ium Hydrogensulfate a versatile task specific ionic liquid catalyst for the synthesis of 4 h pyran scaffolds through non conventional process
Monatshefte Fur Chemie, 2019Co-Authors: Nader Ghaffari Khaligh, Ong, Chiu Ling, Taraneh Mihankhah, Mohd Rafie Johan, Juan, Joon ChingAbstract:In the present study, the catalytic efficiency of 1,1′-butylenebis(3-sulfo-3H-imidazol-1-ium) Hydrogensulfate (BBSI-HSO4) as a versatile sulfonic acid-functionalized ionic liquid was demonstrated for the one-pot mechanosynthesis of pyrano[4,3-b]-pyrans using planetary ball mill at room temperature under solvent-free conditions. This efficient mechanosynthesis approach to the 4H-pyran scaffolds displays a combination of the structure–activity relationship of ionic liquids with ecological benefits of a mechanocatalytic procedure. The ionic liquid was easily recycled and reused several times with no significant loss of its catalytic activity.
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poly 4 vinylpyridinium Hydrogensulfate catalyzed synthesis of 12 aryl 12h indeno 1 2 b naphtho 3 2 e pyran 5 11 13 triones
Tetrahedron Letters, 2012Co-Authors: Nader Ghaffari KhalighAbstract:Abstract A simple and facile synthesis of 12-aryl-12 H -indeno[1,2- b ]naphtho[3,2- e ]pyran-5,11,13-trione derivatives was accomplished via the one-pot condensation of 2-hydroxynaphthalene-1,4-dione, aldehydes, and 2 H -indene-1,3-dione at 100 °C under solvent-free conditions in the presence of the solid acid catalyst, poly(4-vinylpyridinium) Hydrogensulfate. This method has the advantages of high yields, clean reactions, simple methodology, and short reaction times. The catalyst could be recycled and reused four times without significant loss of activity. The structures of the novel compounds were confirmed by IR, 1 H NMR, and elemental analysis.
Peyman Salehi - One of the best experts on this subject based on the ideXlab platform.
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a green approach to the synthesis of 2 3 dihydropyrimidin 2 1h ones by uronium Hydrogensulfate under solvent free conditions
Heterocycles, 2005Co-Authors: Peyman Salehi, Mohammad Ali Zolfigol, Minoo Dabiri, Mostafa BaghbanzadehAbstract:3,4-Dihydropyrimidin-2(1H)-ones and -thiones are synthesized in high yields by a one-pot condensation of an aldehyde, a β-dicarbonyl compound with Hydrogensulfate salt of urea or thiourea under solvent-free conditions.
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efficient synthesis of 3 4 dihydropyrimidin 2 1h ones by aluminum Hydrogensulfate
Polish Journal of Chemistry, 2004Co-Authors: M M Khodaei, Peyman Salehi, Mohammad Ali Zolfigol, S SirouszadehAbstract:3,4-Dihydropyrimidin-2(1H)-ones are synthesized by the three-component condensation of aromatic aldehydes, β-ketoesters and urea or thiourea in methanol or under solvent-free conditions, using aluminum Hydrogensulfate as the catalyst.
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magnesium Hydrogensulfate a cheap and efficient catalyst for the conversion of epoxides into β alkoxy alcohols vicinal diols and thiiranes
ChemInform, 2003Co-Authors: Peyman Salehi, Mohammad Ali Zolfigol, Mohammad Mahdi Khodaei, Afsaneh KeyvanAbstract:Abstract The nucleophilic ring opening reactions of epoxides by aliphatic alcohols and water are achieved efficiently in the presence of catalytic amounts of magnesium Hydrogensulfate, Mg(HSO4)2, with high degree of regioselectivity. The reactions are chemoselective and many of the other functional groups such as ethereal carbon-oxygen bonds as well as carbon–carbon double bond remain intact under the reaction conditions. Epoxides also react with thiourea or ammonium thiocyanate in the presence of Mg(HSO4)2 to afford the corresponding thiiranes in good to excellent yields.
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catalytic friedel crafts acylation of alkoxybenzenes mediated by aluminum Hydrogensulfate in solution and solvent free conditions
Bulletin of the Chemical Society of Japan, 2003Co-Authors: Peyman Salehi, Mohammad Mehdi Khodaei, Mohammad Ali Zolfigol, Sara SirouszadehAbstract:Friedel–Crafts acylation of alkoxybenzenes was achieved efficiently by a reaction with aliphatic acid anhydrides in the presence of catalytic amounts of aluminum Hydrogensulfate, Al(HSO4)3, in nitromethane and under solvent-free conditions. Alkylbenzenes and aryl halides, as well as aromatic anhydrides, remained intact under these conditions.
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Catalytic friedel-crafts acylation of alkoxy benzenes by ferric Hydrogensulfate
Synthetic Communications, 2003Co-Authors: Peyman Salehi, Mohammad Ali Zolfigol, Mohammad Mahdi Khodaei, Shahpour ZeinoldiniAbstract:Abstract Friedel–Crafts acylation of alkoxy benzenes is achieved efficiently by reaction with aliphatic acid anhydrides in the presence of catalytic amounts of ferric Hydrogensulfate, Fe(HSO4)3, in nitromethane. Alkyl benzenes and aryl halides, as well as aromatic anhydrides, remain intact under these conditions.
