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دسترسی آزاد مقاله
1 - Nano silica sulfuric acid catalyzed synthesis of 2-substituted aryl (indolyl) kojic acid derivatives
Zahra Lasemi Bahareh Sadeghi Fereshteh Amiri TavasoliNano silica sulfuric acid as a solid acid, was described to be an effective catalyst for one-pot three-component reaction of kojic acid, aryl aldehydes and indoles for the preparation of 2-substituted aryl (indolyl) kojic acid derivatives. The catalyst was prepared by c چکیده کاملNano silica sulfuric acid as a solid acid, was described to be an effective catalyst for one-pot three-component reaction of kojic acid, aryl aldehydes and indoles for the preparation of 2-substituted aryl (indolyl) kojic acid derivatives. The catalyst was prepared by combination of chlorosulfonic acid to nano silica gel. The size of nanoparticles were observed with SEM.All prepared compounds with melting points, 1H NMR and 13C NMR were characterized. High yields, simple operation, easy-work procedure, mild reaction conditions are some advantages of this protocol. The present method does not involve any hazardous organic solvent. Therefore, this procedure could be classified as green chemistry. پرونده مقاله -
دسترسی آزاد مقاله
2 - Spotlight: Silica sulfuric acid (SSA): As a multipurpose catalyst
Hassan SepehrmansourieHassan Sepehrmansourie was born in Hamedan, Iran in 1994. He received his B.Sc. in Applied Chemistry (2017) from Bu-Ali Sina University, Iran. He received his M.Sc.in Organic Chemistry (2019) under the supervision of Prof. Mohammad Ali Zolfigol. Also, He was also accept چکیده کاملHassan Sepehrmansourie was born in Hamedan, Iran in 1994. He received his B.Sc. in Applied Chemistry (2017) from Bu-Ali Sina University, Iran. He received his M.Sc.in Organic Chemistry (2019) under the supervision of Prof. Mohammad Ali Zolfigol. Also, He was also accepted for a Ph.D. in organic chemistry at the Bu-Ali Sina University in the same year. His research interest is the synthesis, characterization and applications of homogeneous and heterogeneous reagents and catalysts in organic synthesis. پرونده مقاله -
دسترسی آزاد مقاله
3 - Synthesis of 5-amino-1-aryl-4-cyanoimidazoles from formamidines under solvent-free condition
Asieh Yahyazadeh Farhad Shirini Fatamah TavakoliThe aryl-(Z)-N-[2-amino-1,2-dicyanovinyl]formamidine 2 cyclize in solvent-free conditions and in the presence of a base to give a 5-amino-1-aryl-4-cyanoimidazoles 3. Silica sulfuric acid as an efficient and reusable heterogeneous catalyst has been used for the preparati چکیده کاملThe aryl-(Z)-N-[2-amino-1,2-dicyanovinyl]formamidine 2 cyclize in solvent-free conditions and in the presence of a base to give a 5-amino-1-aryl-4-cyanoimidazoles 3. Silica sulfuric acid as an efficient and reusable heterogeneous catalyst has been used for the preparation of amidines 2 from formimidate 1 through reaction with aromatic amines at room temperature and in good to excellent yields. All these derivatives were fully characterized by spectroscopic data. پرونده مقاله -
دسترسی آزاد مقاله
4 - Silica sulfuric acid as an efficient and reusable heterogeneous catalyst for the synthesis of formamidines from the diaminomaleonitrile
Asieh Yahyazadeh Sara Hadesinea Mohammad Saeed DaneshmandiSilica sulfuric acid as an efficient and reusable heterogeneous catalyst has been used for the preparation of amidines 2 from formimidate 1 by reaction with aromatic amines at room temperature in good to excellent yields. Imidate was prepared by treatment of equimolar q چکیده کاملSilica sulfuric acid as an efficient and reusable heterogeneous catalyst has been used for the preparation of amidines 2 from formimidate 1 by reaction with aromatic amines at room temperature in good to excellent yields. Imidate was prepared by treatment of equimolar quantities of triethyl orthoformate and diaminomaleonitrile in refluxing dioxane. All the compounds were characterized fully by spectroscopic techniques. پرونده مقاله -
دسترسی آزاد مقاله
5 - Silica sulfuric acid mediated protection of carbonyl groups as 2,4- dinitrophenylhydrazone
Mehdi Fallah-Mehrjardi Ali Reza KiasatSilica sulfuric acid is employed as solid acid catalyst for the clean and less hazardousprotection of carbonyl compounds as 2,4-dinitrophenylhydrazone under solvent-free conditions.Silica sulfuric acid is employed as solid acid catalyst for the clean and less hazardousprotection of carbonyl compounds as 2,4-dinitrophenylhydrazone under solvent-free conditions. پرونده مقاله