The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Fuwei Li - One of the best experts on this subject based on the ideXlab platform.
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Nitrogen Dioxide catalyzed electrophilic iodination of arenes
ChemInform, 2014Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes.
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Nitrogen Dioxide‐Catalyzed Electrophilic Iodination of Arenes.
ChemInform, 2014Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes.
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Nitrogen Dioxide catalyzed electrophilic iodination of arenes
Advanced Synthesis & Catalysis, 2013Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes. Different from the transition metal catalysts, Nitrogen Dioxide can be easily separated from the final products, and is free of heavy metal waste. Although the present catalyst precursor is toxic, it does not stain the final products due to its low-boiling character. No other reagents apart from 0.5equiv. of iodine (I-2), 6.5mol% Nitrogen Dioxide and acetonitrile solvent were used in the iodination, and basically all the iodine atoms in the iodine source were transferred to the iodination products, showing that the presented protocol is highly atom-economic and practical.
Jianji Wang - One of the best experts on this subject based on the ideXlab platform.
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Nitrogen Dioxide catalyzed electrophilic iodination of arenes
ChemInform, 2014Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes.
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Nitrogen Dioxide‐Catalyzed Electrophilic Iodination of Arenes.
ChemInform, 2014Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes.
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Nitrogen Dioxide catalyzed electrophilic iodination of arenes
Advanced Synthesis & Catalysis, 2013Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes. Different from the transition metal catalysts, Nitrogen Dioxide can be easily separated from the final products, and is free of heavy metal waste. Although the present catalyst precursor is toxic, it does not stain the final products due to its low-boiling character. No other reagents apart from 0.5equiv. of iodine (I-2), 6.5mol% Nitrogen Dioxide and acetonitrile solvent were used in the iodination, and basically all the iodine atoms in the iodine source were transferred to the iodination products, showing that the presented protocol is highly atom-economic and practical.
Huantao Shang - One of the best experts on this subject based on the ideXlab platform.
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Nitrogen Dioxide catalyzed electrophilic iodination of arenes
ChemInform, 2014Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes.
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Nitrogen Dioxide‐Catalyzed Electrophilic Iodination of Arenes.
ChemInform, 2014Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes.
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Nitrogen Dioxide catalyzed electrophilic iodination of arenes
Advanced Synthesis & Catalysis, 2013Co-Authors: Huantao Shang, Xinzhe Tian, Shuang Zhao, Qian Wang, Jianji Wang, Fuwei LiAbstract:Nitrogen Dioxide is demonstrated to be an effective catalyst precursor for the iodination of alkoxy-substituted benzenes and naphthalenes. Different from the transition metal catalysts, Nitrogen Dioxide can be easily separated from the final products, and is free of heavy metal waste. Although the present catalyst precursor is toxic, it does not stain the final products due to its low-boiling character. No other reagents apart from 0.5equiv. of iodine (I-2), 6.5mol% Nitrogen Dioxide and acetonitrile solvent were used in the iodination, and basically all the iodine atoms in the iodine source were transferred to the iodination products, showing that the presented protocol is highly atom-economic and practical.
N. Nakano - One of the best experts on this subject based on the ideXlab platform.
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Improvement of a monitoring tape for Nitrogen Dioxide in air
Talanta, 1999Co-Authors: Kunio Nagashima, N. NakanoAbstract:Abstract A porous cellulose tape containing a silica gel that was previously impregnated with a processing solution containing p-toluenesulfonic acid, sulfanilic acid, N-1-naphthyl ethylene diamine dihydrochloride, ethylene glycol and methanol has been developed to provide a highly sensitive detection of Nitrogen Dioxide in air. When the sample including Nitrogen Dioxide was passed through the tape, the color of tape changed to red, and the degree of color change could be recorded by measuring the intensity of reflecting light (555 nm). The calibration graph was linear up to ∼0.10 ppm. The detection limit was 0.5 ppb for Nitrogen Dioxide with a sampling time of 8 min and a flow rate of 60 ml min−1. No interferences were observed from ammonia (40 ppm), sulfur Dioxide (51 ppm), carbon Dioxide (21%), ozone (0.75 ppm), hydrogen sulfide (27 ppm) or Nitrogen monoxide (99 ppm).
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Development of a monitoring tape for Nitrogen Dioxide in air
Analytica Chimica Acta, 1996Co-Authors: N. NakanoAbstract:Abstract A porous cellulose tape containing a silica gel impregnated with a processing solution that includes p-toluenesulfonic acid, sulfanilic acid, N-(1-naphthyl)ethylenediamine dihydrochloride, glycerin and methanol has been developed to provide a highly sensitive means of detecting Nitrogen Dioxide in air. When the sample including Nitrogen Dioxide was passed through the tape, the color of tape changed to red. The degree of color change was proportional to the concentration of Nitrogen Dioxide at a constant sampling time of flow rate. The degree of color change could be recorded by measuring the intensity of reflecting light (555 nm). The detection limit was 1 ppb for Nitrogen Dioxide with a sampling time of 10 min and a flow rate of 30 ml/min. Reproducibility tests showed that the relative standard deviation of response (n = 10) was 3.5% for 0.1 ppm Nitrogen Dioxide. No interference was observed from methanol (0.5 vol.%), ammonia (40 ppm), ethylene (99.9 vol.%), hydrogen (99.9%), carbon monoxide (306 ppm), sulfur Dioxide (50.6 ppm), carbon Dioxide (20.5 vol.%), chlorine (2.5 ppm), hydrogen sulfide (27.1 ppm) or Nitrogen monoxide (99.1 ppm).
Göran Rydgren - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Nitrogen Dioxide scavengers during delivery of inhaled nitric oxide
BJA: British Journal of Anaesthesia, 1998Co-Authors: Lars Lindberg, Göran RydgrenAbstract:We have analysed the ability of three Nitrogen Dioxide absorbing materials (soda lime, noXon and zeolite) to act as Nitrogen Dioxide scavengers during delivery of inhaled nitric oxide. Different mixtures of gas were produced in a ventilator (Servo Ventilator 300) and passed through an inspiratory tube. Concentrations of Nitrogen Dioxide and nitric oxide were measured in the distal part of the tube, with and without the gas having passed through a canister containing the different filter materials. Our findings indicated that Nitrogen Dioxide was absorbed effectively by all filter materials but that there was re-formation of Nitrogen Dioxide from nitric oxide and oxygen in or immediately after the canister. This initial production of Nitrogen Dioxide was very rapid and could not be prevented by the use of scavengers. Thus soda lime and zeolite had no practical effect as scavengers in this delivery system, and the effect of noXon was very slight.
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Production of Nitrogen Dioxide in a delivery system for inhalation of nitric oxide: a new equation for calculation.
BJA: British Journal of Anaesthesia, 1998Co-Authors: Lars Lindberg, Göran RydgrenAbstract:We have evaluated the kinetics of Nitrogen Dioxide production in a system for inhalation of nitric oxide. In addition to a small fraction of contamination of Nitrogen Dioxide in the nitric oxide stock gas, a considerable part of the total concentration of Nitrogen Dioxide is formed immediately after mixing of nitric oxide and oxygen. This initial build-up of Nitrogen Dioxide is followed by a linear, time-dependent increase in the concentration of Nitrogen Dioxide. An equation describing the concentration of Nitrogen Dioxide in the delivery system is formulated: [NO2] = kA x [NO] + kB x [NO]2 x [O2] + kC x t x [NO]2 x [O2], where Nitrogen Dioxide [NO2] and nitric oxide [NO] concentrations are in parts per million (ppm), oxygen concentration [O2] is expressed as a percentage and contact time (t) is in seconds. The rate constants are kA = 5.12 x 10(-3), kB = 1.41 x 10(-6) and kC = 0.86 x 10(-6). Calculated Nitrogen Dioxide values correlated well with measured concentrations. This new finding of an initial build-up of Nitrogen Dioxide has to be taken into consideration if the conversion of nitric oxide to Nitrogen Dioxide is to be calculated and in the safety guidelines for the use of nitric oxide.
