ON 4-(OR 5-) AMINOGLYOXALINE (IMINAZOLE)

1941 ◽  
Vol 19b (12) ◽  
pp. 296-304 ◽  
Author(s):  
G. Hunter ◽  
J. A. Nelson
Keyword(s):  
Pure State ◽  
Aqueous Media ◽  
Hydrolysis Product ◽  
First Time

The dihydrochloride and sesquipicrate salts of 4-(or 5-)aminoglyoxaline have been prepared in the pure state for the first time. Previous attempts to isolate the substance have failed largely because insufficient allowance was made for the instability of the substance in aqueous media. The new glyoxaline is highly reactive and has unusual properties for a glyoxaline. It has certain properties like those of 4-(or 5-)guanidinoglyoxaline, being here proved to be a hydrolysis product of guanine.

Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

2018 ◽  
Vol 9 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Shubhangi J. Mane-Gavade ◽  
Sandip R. Sabale ◽  
Xiao-Ying Yu ◽  
Gurunath H. Nikam ◽  
Bhaskar V. Tamhankar
Keyword(s):  
Green Synthesis ◽  
Color Change ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Suitable Condition ◽  
Cost Effective ◽  
Spectroscopic Studies ◽  
Calibration Plot ◽  
First Time

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

scholarly journals Synthesis of novel adsorbent based on tetrasulfide-functionalized fibrous silica KCC-1 for removal of Hg(II) cations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Azam Marjani ◽  
Reza Khan Mohammadi
Keyword(s):  
Effective Interaction ◽  
Sol Gel ◽  
Aqueous Media ◽  
Synthesis Method ◽  
Mercury Ions ◽  
Toxic Heavy Metals ◽  
Uptake Capacity ◽  
Hydrothermal Preparation ◽  
Ultrasonic Assisted ◽  
First Time

AbstractHg(II) has been identified to be one of the extremely toxic heavy metals because of its hazardous effects and this fact that it is even more hazardous to animals than other pollutants such as Ag, Au, Cd, Ni, Pb, Co, Cu, and Zn. Accordingly, for the first time, tetrasulfide-functionalized fibrous silica KCC-1 (TS-KCC-1) spheres were synthesized by a facile, conventional ultrasonic-assisted, sol–gel-hydrothermal preparation approach to adsorb Hg(II) from aqueous solution. Tetrasulfide groups (–S–S–S–S–) were chosen as binding sites due to the strong and effective interaction of mercury ions (Hg(II)) with sulfur atoms. Hg(II) uptake onto TS-KCC-1 in a batch system has been carried out. Isotherm and kinetic results showed a very agreed agreement with Langmuir and pseudo-first-order models, respectively, with a Langmuir maximum uptake capacity of 132.55 mg g–1 (volume of the solution = 20.0 mL; adsorbent dose = 5.0 mg; pH = 5.0; temperature: 198 K; contact time = 40 min; shaking speed = 180 rpm). TS-KCC-1was shown to be a promising functional nanoporous material for the uptake of Hg(II) cations from aqueous media. To the best of our knowledge, there has been no report on the uptake of toxic Hg(II) cations by tetrasulfide-functionalized KCC-1 prepared by a conventional ultrasonic-assisted sol–gel-hydrothermal synthesis method.

scholarly journals Seasonal Variation of Glucosinolate Hydrolysis Products in Commercial White and Red Cabbages (Brassica oleracea var. capitata)

Foods ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1682
Author(s):  
Nicole S. Wermter ◽  
Sascha Rohn ◽  
Franziska S. Hanschen
Keyword(s):  
Seasonal Variation ◽  
Hydrolysis Product ◽  
Red Cabbage ◽  
Beneficial Effects ◽  
Hydrolysis Products ◽  
Food Retailers ◽  
Brassica Vegetables ◽  
Health Promoting ◽  
First Time ◽  
Excellent Source

Brassica vegetables contain glucosinolates, which are well-known for their potential to form health-promoting isothiocyanates. Among those crucifers, white and red cabbage are commonly consumed vegetables, exhibiting different glucosinolate and hydrolysis profiles thereof. Regarding the health beneficial effects from these vegetables, more information, especially concerning the seasonal variation of glucosinolate profiles and the formation of their bioactive hydrolysis products in commercial cabbages, is needed. In this study, glucosinolates and glucosinolate hydrolysis product profiles in red and white cabbages from three different food retailers were monitored over six different sampling dates across the selling season in autumn. For the first time, it was shown that, while glucosinolate profiles were similar in each cabbage variety, glucosinolate hydrolysis product profiles and hydrolysis behavior varied considerably over the season. The highest total isothiocyanate concentrations were observed in conventional red (1.66 μmol/g FW) and organic white (0.93 μmol/g FW) cabbages purchased at the first sampling date in September. Here, red cabbage was with up to 1.06 μmol/g FW of 4-(methylsulfinyl)butyl isothiocyanate (sulforaphane), an excellent source for this health-promoting isothiocyanate. Cabbages purchased 11 weeks later in autumn released lower levels of isothiocyanates, but mainly nitriles and epithionitriles. The results indicate that commercial cabbages purchased in early autumn could be healthier options than those purchased later in the year.

Rhodium-catalyzed aminohydroxylation of unactivated alkenes in aqueous media for the benign synthesis of 1,2-amino alcohols

2019 ◽  
Vol 21 (4) ◽  
pp. 780-784 ◽  
Author(s):  
Yufeng Shi ◽  
Yufan Wang ◽  
Xunbo Lu ◽  
Yulong Zhang ◽  
Yuzhou Wu ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Amino Alcohols ◽  
Benign Synthesis ◽  
First Time

An efficient catalytic aminohydroxylation reaction of alkenes in aqueous media is disclosed for the first time.

scholarly journals Self-assembled PEG–carboxymethylcellulose nanoparticles/α-cyclodextrin hydrogels for injectable and thermosensitive drug delivery

RSC Advances ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 2905-2912 ◽  
Author(s):  
Lin Dai ◽  
Rui Liu ◽  
Li-Qiu Hu ◽  
Jun-Hui Wang ◽  
Chuan-Ling Si
Keyword(s):  
Drug Delivery ◽  
Inclusion Complex ◽  
Betulinic Acid ◽  
Aqueous Media ◽  
Self Assembled ◽  
First Time

Novel cellulose hydrogels based on the inclusion complex between α-cyclodextrin and binary-drug loaded nanoparticles (carboxymethylcellulose–betulinic acid/hydroxycamptothecine nanoparticles) were prepared in aqueous media for the first time.

scholarly journals High Performance of Simple Organic Phosphorescence Host-Guest Materials

2020 ◽  
Author(s):  
Yunsheng Wang ◽  
Heqi Gao ◽  
Jie Yang ◽  
Manman Fang ◽  
Dan Ding ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Aqueous Media ◽  
Theoretical Research ◽  
Long Afterglow ◽  
Afterglow Time ◽  
New Strategy ◽  
Long Lifetime ◽  
First Time ◽  
Design Guidance

<p><b>The study of purely organic room-temperature phosphorescence (RTP) has drawn </b><b>increasing attention </b><b>because of its considerable theoretical research and practical application </b><b>value</b><b>. Currently, organic RTP materials with both high efficiency (<i>Ф</i><sub>P</sub> > 20%) and a long lifetime (<i>τ</i><sub>P</sub> > 10 s) in air are still </b><b>scarce due to</b><b> the lack of related design guidance. Here, we </b><b>report</b><b> a new strategy to increase the phosphorescence performance of organic materials by integrating the RTP host and RTP guest in one doping system to form </b><b>a </b><b>triplet exciplex. With these materials, the high-contrast </b><b>labelling</b><b> of tumours in living mice and encrypted patterns in thermal printing are both successfully realized for the first time</b><b> by</b><b> taking </b><b>advantage of both</b><b> the long afterglow time (up to 25 min in aqueous media) and high phosphorescence efficiency (43%).</b></p>

Quadrol-Pd(II) complexes: phosphine-free precatalysts for the room-temperature Suzuki-Miyaura synthesis of nucleoside analogues in aqueous media

2022 ◽  
Author(s):  
Jose Luis Serrano ◽  
Sujeet Gaware ◽  
Jose Antonio Pérez de Haro ◽  
Jose Pérez ◽  
Pedro Lozano ◽  
...  
Keyword(s):  
Room Temperature ◽  
Aqueous Media ◽  
Water Soluble ◽  
Nucleoside Analogues ◽  
Synthesis And Characterization ◽  
First Time

Commercially available Quadrol, N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine (THPEN), has been used for the first time as N^N- donor neutral hydrophilic ligand in the synthesis and characterization of new water soluble palladium (II) complexes...

Pyrimidine reactions. XXIV. The dehalogenation of 2-halogenopyrimidines by hydriodic acid

1973 ◽  
Vol 26 (2) ◽  
pp. 443 ◽  
Author(s):  
DJ Brown ◽  
P Waring
Keyword(s):  
Pure State ◽  
Hydriodic Acid ◽  
Chloro Derivatives ◽  
Amino Pyrimidine ◽  
First Time ◽  
Derivatives Of ◽  
Improved Methods ◽  
Iodo Derivative ◽  
Made In

2-Halogenopyrimidines underwent dehalogenation conveniently on treatment with hot hydriodic acid; 4,6-dimethyl-, 4,6-diphenyl-, 5- methyl-, 4-methyl-, and 4-amino-pyrimidine were so prepared from their respective 2-chloro derivatives, of which the second and third were made by improved methods; unsubstituted pyrimidine was obtained similarly from its 2-chloro, 2-bromo, or 2-iodo derivative, of which the last was made in a pure state for the first time. In contrast, 4- chloro-2,6-dimethylpyrimidine underwent hydrolysis in hot hydriodic acid and transhalogenation to give its 4-iodo analogue at lower temperatures; both 2-chloro-4-methoxy-pyrimidine and 5-chlorouracil gave uracil with hot hydriodic acid; and 4-chloro- 2,6- dimethoxypyrimidine gave 6-iodouracil under similar conditions.

[28]Hexaphyrin derivatives for anion recognition in organic and aqueous media

2016 ◽  
Vol 52 (10) ◽  
pp. 2181-2184 ◽  
Author(s):  
Flávio Figueira ◽  
Andreia S. F. Farinha ◽  
Paulino V. Muteto ◽  
Marcelo D. Polêto ◽  
Hugo Verli ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Anion Recognition ◽  
First Time

Hexaphyrin-based anion chemosensors are reported for the first time.

scholarly journals Characteristics and Mechanism of Vinyl Ether Cationic Polymerization in Aqueous Media Initiated by Alcohol/B(C6F5)3/Et2O

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 500
Author(s):  
Jinghan Zhang ◽  
Yibo Wu ◽  
Kaixuan Chen ◽  
Min Zhang ◽  
Liangfa Gong ◽  
...  
Keyword(s):  
Vinyl Ether ◽  
Cationic Polymerization ◽  
Density Functional ◽  
Aqueous Media ◽  
Vinyl Ethers ◽  
Experimental Conditions ◽  
Functional Theory ◽  
Air Atmosphere ◽  
Significant Difference ◽  
First Time

Aqueous cationic polymerizations of vinyl ethers (isobutyl vinyl ether (IBVE), 2-chloroethyl vinyl ether (CEVE), and n-butyl vinyl ether (n-BVE)) were performed for the first time by a CumOH/B(C6F5)3/Et2O initiating system in an air atmosphere. The polymerization proceeded in a reproducible manner through the careful design of experimental conditions (adding initiator, co-solvents, and surfactant or decreasing the reaction temperature), and the polymerization characteristics were systematically tested and compared in the suspension and emulsion. The significant difference with traditional cationic polymerization is that the polymerization rate in aqueous media using B(C6F5)3/Et2O as a co-initiator decreases when the temperature is lowered. The polymerization sites are located on the monomer/water surface. Density functional theory (DFT) was applied to investigate the competition between H2O and alcohol combined with B(C6F5)3 for providing a theoretical basis. The effectiveness of the proposed mechanism for the aqueous cationic polymerization of vinyl ethers using CumOH/B(C6F5)3/Et2O was confirmed.

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