Methylamines

Gysel, August B. van; Musin, Willy

doi:10.1002/14356007.a16_535.pub2

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Dimethylamine (DMA) as an organic pollutant is a small and simple molecule that is extensively used in many chemical industries as a precursor and raw material. It is used for the production of some surfactant wetting agents, rubber vulcanizing accelerators, accelerators of manufacturing plastic epoxy resins, pigment of polyurethane rubber, leather tanning materials, softeners, lubricants; textile water-proofing agents, cationic surfactants, cellulose acetate rayon treatment substances, rocket propellants, pharmaceuticals (e.g., dimefox, diphenhydramine, metformin, tramadol), agrichemicals (carbamate pesticides, pheromones), and chemical weapons (tabun nerve agent) [3,4]. Dimethylamine (DMA) is also produced by many biological and aquatic systems [5,6,7], associated with some drugs as impurity [8] and released with environmental hazardous waste [9,10].…”

Section: Introductionmentioning

confidence: 99%

Potentiometric PVC-Membrane-Based Sensor for Dimethylamine Assessment Using A Molecularly Imprinted Polymer as A Sensory Recognition Element

et al. 2019

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A new simple potentiometric sensor is developed and presented for sensitive and selective monitoring of dimethylamine (DMA). The sensor incorporates a molecularly imprinted polymer, with a pre-defined specific cavity suitable to accommodate DMA. The molecularly imprinted polymer (MIP) particles were dispersed in an aplasticized poly(vinyl chloride) matrix. The MIP is synthesized by using a template molecule (DMA), a functional monomer (acrylamide, AM), cross-linker (ethylene glycol dimethacrylate, EGDMA) and initiating reagent (benzoylperoxide, BPO). Using Trizma buffer solution (5 mmol L−1, pH 7.1), the sensor exhibits a rapid, stable and linear response for 1.0 × 10−5 to 1.0 × 10−2 mol L−1 DMA+ with a calibration slope of 51.3 ± 0.3 mV decade−1, and a detection limit of 4.6 × 10−6 mol L−1 (0.37 µg mL−1). The electrode exhibited a short response time (10 s) and stable potential readings (± 0.5 mV) for more than 2 months. Potentiometric selectivity measurements of the sensor reveal negligible interferences from most common aliphatic and aromatic amines. High concentration levels (100-fold excess) of many inorganic cations do not interfere. The sensor is successfully used for quantification of low levels of DMA down to 0.5 µg mL–1. Verification of the presented method was carried out after measuring the detection limit, working linearity range, ruggedness of the method, accuracy, precision, repeatability and reproducibility. Under flow-through conditions, the proposed sensor in its tubular form is prepared and introduced in a two-channel flow injection setup for hydrodynamic determination of DMA. The sampling rate is 50–55 samples h–1. The sensor is used to determine DMA in different soil samples with an accuracy range of 97.0–102.8%.

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Section: Introductionmentioning

confidence: 99%

Potentiometric PVC-Membrane-Based Sensor for Dimethylamine Assessment Using A Molecularly Imprinted Polymer as A Sensory Recognition Element

et al. 2019

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“…Reagents powerful enough to activate these aliphatic C–H bonds are also easily capable of further reacting with the products of the initial reactions, thus limiting selectivity . Carbon–nitrogen bonds are important for applications such as medicine, pharmacology, and polymer synthesis. , Currently, many C–N bond formations are catalyzed with palladium, an expensive reagent, via coupling chemistry, which requires multiple synthetic steps. Ideally, C–N bonds could be synthesized via direct activation and functionalization of a C–H bond by a nitrene (NR) functionality. , …”

Section: Introductionmentioning

confidence: 99%

5d Metal(IV) Imide Complexes. The Impact (or Lack Thereof) of d-Orbital Occupation on Methane Activation and Functionalization

Moulder

Cundari

2017

Inorg. Chem.

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This research evaluates 5d metal imide complexes, (OH)M═NMe (M = W, Re, or Os), and their reactions with methane to form dimethylamine. Each is calculated to follow a consistent reaction pathway regardless of the metal's d-orbital occupation, whereby the methane C-H bond undergoes oxidative addition (OA) to the metal and then the methyl migrates from the metal to the nitrogen to form an amide. Finally, hydrogen migrates to the nitrogen before dissociating to form amine products. While homolytic M-imide, M-amide M-H, and M-CH bond dissociation free energies (BDFEs) were analyzed, the BDFEs of neither hexavalent nor tetravalent metal moieties reflect the oxidative addition kinetics. Instead, a strain theory approach, supported by electron density analysis for the OA transition state, is found to be explanatory. Notably, the rate-determining step, the hydrogen migration transition state, has a consistent jump in free energy versus the preceding intermediate, (OH)M(H)-N(CH)Me, for all metals evaluated. Thus, the height of the RDS is largely reflective of the stability of the M-amide intermediate, suggesting a strategy for viable catalysis.

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Methylamines

Cited by 2 publications

References 5 publications

Potentiometric PVC-Membrane-Based Sensor for Dimethylamine Assessment Using A Molecularly Imprinted Polymer as A Sensory Recognition Element

Potentiometric PVC-Membrane-Based Sensor for Dimethylamine Assessment Using A Molecularly Imprinted Polymer as A Sensory Recognition Element

5d Metal(IV) Imide Complexes. The Impact (or Lack Thereof) of d-Orbital Occupation on Methane Activation and Functionalization

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