New silatranes possessing urea functionality: Synthesis, characterization and their structural aspects

Puri, J. K.; Singh, Raghubir; Kaur, Varinder; Sharma, Raj Pal; Wagler, Jörg; Kroke, Edwin

doi:10.1016/j.jorganchem.2010.12.039

Cited by 19 publications

(8 citation statements)

References 30 publications

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“…Gas/liquid chromatography–mass spectroscopy (GC/LC–MS), infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy are methods that are frequently employed. 1−4 Nuclear magnetic resonance (NMR) spectroscopy is a particularly versatile technique and is the method of choice for elucidation of molecular structure of organic compounds in a broad range of fields. 5 NMR has also proven to be very suitable for the study of organic reactions.…”

Section: Introductionmentioning

confidence: 99%

Inline Reaction Monitoring of Amine-Catalyzed Acetylation of Benzyl Alcohol Using a Microfluidic Stripline Nuclear Magnetic Resonance Setup

et al. 2019

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We present an in-depth study of the acetylation of benzyl alcohol in the presence of N , N -diisopropylethylamine (DIPEA) by nuclear magnetic resonance (NMR) monitoring of the reaction from 1.5 s to several minutes. We have adapted the NMR setup to be compatible to microreactor technology, scaling down the typical sample volume of commercial NMR probes (500 μL) to a microfluidic stripline setup with 150 nL detection volume. Inline spectra are obtained to monitor the kinetics and unravel the reaction mechanism of this industrially relevant reaction. The experiments are combined with conventional 2D NMR measurements to identify the reaction products. In addition, we replace DIPEA with triethylamine and pyridine to validate the reaction mechanism for different amine catalysts. In all three acetylation reactions, we find that the acetyl ammonium ion is a key intermediate. The formation of ketene is observed during the first minutes of the reaction when tertiary amines were present. The pyridine-catalyzed reaction proceeds via a different mechanism.

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Section: Introductionmentioning

confidence: 99%

Inline Reaction Monitoring of Amine-Catalyzed Acetylation of Benzyl Alcohol Using a Microfluidic Stripline Nuclear Magnetic Resonance Setup

et al. 2019

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“…m ‐Cresol and tetraethoxysilane were purchased from Aldrich, Germany. Bare silica nanoparticles were prepared by Stober's method , and N ‐[3‐(triethoxysilyl)propyl]morpholine‐4‐carboxylic acid amide was prepared using reported method .The stock solution of 1000 μg/mL of m ‐cresol was prepared and diluted further to obtain desired concentrations.…”

Section: Methodsmentioning

confidence: 99%

“…The interaction between functional monomer and target is important factor, which decides the rate for the uptake of target on to the solid sorbent. In our recently reported urea derivatives of various silanes, N ‐[3‐(triethoxysilyl)propyl]morpholine‐4‐carboxylic acid amide contains –NH–C( =O)–N and –O– groups for hydrogen bond interactions . Therefore, expecting it to be capable of donor–acceptor bond interactions, we explored its potential to recognize phenolic moieties.…”

Section: Introductionmentioning

confidence: 99%

Imprinted silica nanoparticles coated with N -propylsilylmorpholine-4-carboxamide for the determination of m -cresol in synthetic and real samples

et al. 2015

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m-Cresol-imprinted silica nanoparticles coated with N-propylsilylmorpholine-4-carboxamide have been developed that contain specific pockets for the selective uptake of m-cresol. Silica nanoparticles were synthesized by a sol-gel process followed by functionalization of their surface with N-propylsilylmorpholine-4-carboxamide. The formation of m-cresol-imprinted silica nanoparticles was confirmed by UV-Vis spectrophotometry, infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and transmission electron microscopy. Electron microscopic studies revealed the formation of monodispersed imprinted silica nanoparticles with spherical shape and an average size of 83 nm. The developed nanoparticles were filled in a syringe and used for the extraction of m-cresol from aqueous samples followed by quantification using high-performance liquid chromatography with diode array detection. Various adsorption experiments showed that developed m-cresol-imprinted silica nanoparticles exhibited a high adsorption capacity and selectivity and offered a fast kinetics for rebinding m-cresol. The chromatographic quantification was achieved using mobile phase consisting of acetonitrile/water (70:30 v/v) at an isocratic flow rate of 1.0 mL/min using a reversed-phase C18 column and detection at λmax = 275 nm. The limits of detection and quantification were 1.86 and 22.32 ng/mL, respectively, for the developed method. The percent recoveries ranged from 96.66-103.33% in the spiked samples. This combination of this nanotechnique with molecular imprinting was proved as a reliable, sensitive and selective method for determining the target from synthetic and real samples.

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“…A survey of literature reveals that the present stage of knowledge about the organosilicon complexes of mixed azines containing N, O donor system is rather scanty. So in continuation with our previous studies on hyper-coordinate silicon (IV) compounds [9][10][11][12][13][14][15][16][17][18][19][20][21][22] we considered it worthwhile to synthesize and characterize novel neutral hexa-coordinated silicon (IV) complexes with mixed azine ligands. DMSO solution of complexes were studied for their antifungal activity against Candida albicans used as model organism.…”

Section: Introductionmentioning

confidence: 90%

Synthesis, Characterization and Antifungal Studies of Organosilicon (IV) Complexes Derived From Mixed Azines

2017

JCBSC

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New silatranes possessing urea functionality: Synthesis, characterization and their structural aspects

Cited by 19 publications

References 30 publications

Inline Reaction Monitoring of Amine-Catalyzed Acetylation of Benzyl Alcohol Using a Microfluidic Stripline Nuclear Magnetic Resonance Setup

Inline Reaction Monitoring of Amine-Catalyzed Acetylation of Benzyl Alcohol Using a Microfluidic Stripline Nuclear Magnetic Resonance Setup

Imprinted silica nanoparticles coated with N -propylsilylmorpholine-4-carboxamide for the determination of m -cresol in synthetic and real samples

Synthesis, Characterization and Antifungal Studies of Organosilicon (IV) Complexes Derived From Mixed Azines

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