Silica-bonded<i>S</i>-sulfonic acid as a recyclable catalyst for the silylation of hydroxyl groups with hexamethyldisilazane (HMDS)

Niknam, Khodabakhsh; Saberi, Dariush; Molaee, Hajar; Zolfigol, Mohammad Ali

doi:10.1139/v09-162

Cited by 20 publications

(10 citation statements)

References 52 publications

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“…Niknam et al . have reported the synthesis and application of a bulky, amorphous silica‐bonded S ‐sulfonic acid (SBSSA) as a reusable catalyst for the preparation of aromatic 1,1‐diacetates, quinoxalines, 4,4 ′ ‐(arylmethylene)bis(1 H –pyrazol‐5‐ols), α ‐amino nitriles, 1,8‐dioxo‐decahydroacridines, 1,8‐dioxo‐octahydroxanthenes, bis‐indolylmethanes, silylated alcohols, trisubstituted imidazoles, 2,3‐dihydroquinazolin‐4(1 H )‐ones, and 2‐aryl‐1‐arylmethyl‐1 H ‐1,3‐benzimidazoles…”

Section: Introductionmentioning

confidence: 99%

An efficient catalytic method for the synthesis of pyrido[2,3‐d]pyrimidines as biologically drug candidates by using novel magnetic nanoparticles as a reusable catalyst

Moradi

Zolfigol

Zarei

et al. 2017

Applied Organom Chemis

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A convenient method for the synthesis of pyrido[2,3‐d]pyrimidines by using the novel nano‐magnetic silica‐bonded S‐sulfonic acid[Fe3O4@SiO2@(CH2)3S–SO3H] as an efficient and recyclable catalyst under neat conditions is described. The major advantages of the present methodology are high yield, short reaction time, and reusability of the catalyst. Furthermore, the nano‐magnetic silica‐bonded S‐sulfonic acid was fully characterized by using various techniques such as FT‐IR, TG/DTG, DTA, EDX, μXRF, XRD, HRTEM, SEM, SEM elemental mapping, XPS, and N2 physisorption. The results obtained from this research support the idea of rational design, synthesis, and applications of task‐specific and reusable catalysts for the preparation of various polynitrogenated heterocyclic compounds containing 1,4‐dihydropyridine moieties.

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Section: Introductionmentioning

confidence: 99%

An efficient catalytic method for the synthesis of pyrido[2,3‐d]pyrimidines as biologically drug candidates by using novel magnetic nanoparticles as a reusable catalyst

Moradi

Zolfigol

Zarei

et al. 2017

Applied Organom Chemis

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“…The 2-(3-indolyl) -4,5 di phynyl imidazole. (IDPI) was synthesized, purified and characterized according to the literature [27].…”

Section: Reagentsmentioning

confidence: 99%

Determination of Trace Amount of Lead (11) and Cadmium (11) Ions in Real Water and Real Samples by Flame Atomic Absorption Spectrometry After Cloud Point Extraction Using Selective Synthesis Ligand2-(3- indolyl) – 4,5 di phynyl imidazole

Vatankhah¹,

Ebrahimi²,

Kahani³

2017

Eurasian J Anal Chem

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A simple, sensitive and feasible cloud-point extraction (CPE) methodology has been developed for the separation and preconcentration of cadmium and lead ions in real samples. The metals in the aqueous solution were complexes with 2-(3-indolyl)-4,5 di phynyl imidazole.(IDPI), at pH = 7.0 and Triton X-114 was added as surfactant. The variables effecting like concentration of Triton X-114 and HNO3, bath temperature, centrifuge rate and time on the cloud-point extraction were optimized. Under optimum conditions, the response are linear over concentration range of 0.025-1.3(µg mL-1) for Cd 2+ , 0.064-1.27(µg mL-1) for Pb 2+ andRSD % (n =5) 1.4 for Cd 2+ , 1.3 for Pb 2+ , detection limits (3SDb/m, n =10, m = slope of calibration) of 0.15 (µg.mL-1) for Cd 2+ and 0.13 (µg.mL-1) Pb 2+ respectively. The enrichment factors were 31 for Cd 2+ and 37 for Pb 2+. The preconcentration factors were 26 for Cd 2+ and 31 for Pb 2+ respectively.

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“…All the products are known and were characterized by comparison of their spectra (IR, 1 H NMR), TLC and physical data with those reported in the literature. 46…”

Section: General Remarksmentioning

confidence: 99%

Preparation of different amides via Ritter reaction from alcohols and nitriles in the presence of silica-bonded N- propyl sulphamic acid (SBNPSA) under solvent-free conditions

2012

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A number of methods have been proposed for the modification of the Ritter reaction. However, many of these methods involve the use of strongly acidic conditions, stoichiometric amounts of reagents, harsh reaction conditions and extended reaction times. Therefore, the development of mild, efficient, convenient and benign reagents for the Ritter reaction is desirable. In this research, we have developed a clean and environmentally friendly protocol for the synthesis of amides by using different benzylic or tertiary alcohols and different nitriles in the presence of silica-bonded N-propyl sulphamic acid (SBNPSA) as catalyst under solvent-free conditions in high yields.

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Silica-bondedS-sulfonic acid as a recyclable catalyst for the silylation of hydroxyl groups with hexamethyldisilazane (HMDS)

Cited by 20 publications

References 52 publications

An efficient catalytic method for the synthesis of pyrido[2,3‐d]pyrimidines as biologically drug candidates by using novel magnetic nanoparticles as a reusable catalyst

An efficient catalytic method for the synthesis of pyrido[2,3‐d]pyrimidines as biologically drug candidates by using novel magnetic nanoparticles as a reusable catalyst

Determination of Trace Amount of Lead (11) and Cadmium (11) Ions in Real Water and Real Samples by Flame Atomic Absorption Spectrometry After Cloud Point Extraction Using Selective Synthesis Ligand2-(3- indolyl) – 4,5 di phynyl imidazole

Preparation of different amides via Ritter reaction from alcohols and nitriles in the presence of silica-bonded N- propyl sulphamic acid (SBNPSA) under solvent-free conditions

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