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.

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 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.

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.

Towards Benign Synthesis of Indenes from Indanones: Zinc-Mediated Allylation of Ketones in Aqueous Media as a Source of Substituted Indenyl Ligand Precursors

2005 ◽  
Vol 2005 (6) ◽  
pp. 1058-1081 ◽  
Author(s):  
Satu Silver ◽  
Ann-Sofie Leppänen ◽  
Rainer Sjöholm ◽  
Antti Penninkangas ◽  
Reko Leino
Keyword(s):  
Aqueous Media ◽  
Benign Synthesis ◽  
Ligand Precursors

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>

Direct hydroxyethylation of amines by carbohydrates via ruthenium catalysis

2019 ◽  
Vol 21 (11) ◽  
pp. 3127-3132 ◽  
Author(s):  
Le Jia ◽  
Mohamed Makha ◽  
Chen-Xia Du ◽  
Zheng-Jun Quan ◽  
Xi-Cun Wang ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Amino Alcohols ◽  
Ruthenium Catalysis ◽  
Halogen Free ◽  
First Time

A halogen-free catalytic methodology for the synthesis of β-amino alcohols from aromatic amines and biomass-related carbohydrates is demonstrated for the first time.

Hemin-catalyzed biomimetic oxidative phenol–indole [3 + 2] reactions in aqueous media

2019 ◽  
Vol 17 (47) ◽  
pp. 9994-9998 ◽  
Author(s):  
Yu Fu ◽  
Qile Yu ◽  
Yulong Zhang ◽  
Zhonghong Gao ◽  
Yuzhou Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic System ◽  
Aqueous Media ◽  
Benign Synthesis

A hemin/H2O2 catalytic system for oxidative phenol–indole [3 + 2] coupling in aqueous solution has been developed, enabling benign synthesis of valuable benzofuroindolines under sustainable conditions.

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...

scholarly journals Insights into Ag(i)-catalyzed addition reactions of amino alcohols to electron-deficient olefins: competing mechanisms, role of catalyst, and origin of chemoselectivity

RSC Advances ◽  
2018 ◽  
Vol 8 (70) ◽  
pp. 40338-40346 ◽  
Author(s):  
Chunhui Liu ◽  
Peilin Han ◽  
Zhizhong Xie ◽  
Zhihong Xu ◽  
Donghui Wei
Keyword(s):  
Amino Alcohols ◽  
Addition Reactions ◽  
First Time

The origin of the chemoselectivities of Ag(i)-catalyzed addition reactions of amino alcohols to olefin has been predicted for the first time.

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