Phosphomolybdate assembly as a low-cost catalyst for the reduction of toxic Cr(vi) in aqueous solution

2017 ◽  
Vol 46 (24) ◽  
pp. 7917-7925 ◽  
Author(s):  
Xiaoxiao Wang ◽  
Jiaojiao Wang ◽  
Zongke Geng ◽  
Zhao Qian ◽  
Zhangang Han
Keyword(s):  
Activation Energy ◽  
Aqueous Solution ◽  
Formic Acid ◽  
Low Cost ◽  
Hybrid Compound ◽  
Molecular Catalyst ◽  
Mild Conditions

A fully reduced phosphomolybdate hybrid compound was active as a heterogeneous molecular catalyst to reduce toxic Cr(vi) to nontoxic Cr(iii) using formic acid under mild conditions. The activation energy was calculated to be 78.5 kJ·mol−1.

CO2as a hydrogen vector – transition metal diamine catalysts for selective HCOOH dehydrogenation

2017 ◽  
Vol 46 (5) ◽  
pp. 1670-1676 ◽  
Author(s):  
Cornel Fink ◽  
Gábor Laurenczy
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Formic Acid ◽  
Catalytic Dehydrogenation ◽  
Mild Conditions ◽  
Adjustable Rate

The homogeneous catalytic dehydrogenation of formic acid in aqueous solution provides an efficientin situmethod for hydrogen production, under mild conditions, and at an adjustable rate.

Conversion of wheat straw into formic acid in NaVO3–H2SO4 aqueous solution with molecular oxygen

2015 ◽  
Vol 17 (1) ◽  
pp. 453-459 ◽  
Author(s):  
Muge Niu ◽  
Yucui Hou ◽  
Shuhang Ren ◽  
Weize Wu ◽  
Kenneth N. Marsh
Keyword(s):  
Aqueous Solution ◽  
Formic Acid ◽  
Wheat Straw ◽  
Molecular Oxygen ◽  
High Efficiency ◽  
Mild Conditions ◽  
H2so4 Aqueous Solution

Wheat straw could be directly converted into formic acid in NaVO3–H2SO4 aqueous solution with molecular O2 as an oxidant under mild conditions with a high efficiency.

Pt-Pd Nanoalloy for the Unprecedented Activation of Carbon-Fluorine Bond at Low Temperature

2019 ◽  
Author(s):  
Raghu Nath Dhital ◽  
keigo nomura ◽  
Yoshinori Sato ◽  
Setsiri Haesuwannakij ◽  
Masahiro Ehara ◽  
...  
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Dft Calculations ◽  
Bond Activation ◽  
Mild Conditions ◽  
Selective Transformation ◽  
Rate Determining Step ◽  
Highly Active ◽  
Harsh Conditions ◽  
Reaction Profile

Carbon-Fluorine (C-F) bonds are considered the most inert organic functionality and their selective transformation under mild conditions remains challenging. Herein, we report a highly active Pt-Pd nanoalloy as a robust catalyst for the transformation of C-F bonds into C-H bonds at low temperature, a reaction that often required harsh conditions. The alloying of Pt with Pd is crucial to activate C-F bond. The reaction profile kinetics revealed that the major source of hydrogen in the defluorinated product is the alcoholic proton of 2-propanol, and the rate-determining step is the reduction of the metal upon transfer of the <i>beta</i>-H from 2-propanol. DFT calculations elucidated that the key step is the selective oxidative addition of the O-H bond of 2-propanol to a Pd center prior to C-F bond activation at a Pt site, which crucially reduces the activation energy of the C-F bond. Therefore, both Pt and Pd work independently but synergistically to promote the overall reaction

scholarly journals Spent Coffee Ground as Low-Cost Adsorbent for Congo Red Dye Removal from Aqueous Solution

2021 ◽  
Vol 765 (1) ◽  
pp. 012089
Author(s):  
R Taufik ◽  
M Mohamad ◽  
R Wannahari ◽  
N F Shoparwe ◽  
WHW Osman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Dye Removal ◽  
Low Cost ◽  
Congo Red Dye ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
Red Dye

scholarly journals Practical Synthesis of 2-Iodosobenzoic Acid (IBA) without Contamination by Hazardous 2-Iodoxybenzoic Acid (IBX) under Mild Conditions

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1897
Author(s):  
Hideyasu China ◽  
Nami Kageyama ◽  
Hotaka Yatabe ◽  
Naoko Takenaga ◽  
Toshifumi Dohi
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Practical Method ◽  
Hypervalent Iodine ◽  
Mild Conditions ◽  
Sequential Procedures ◽  
Iodine Compounds ◽  
Practical Synthesis ◽  
Iodosobenzoic Acid ◽  
Lower Temperature

We report a convenient and practical method for the preparation of nonexplosive cyclic hypervalent iodine(III) oxidants as efficient organocatalysts and reagents for various reactions using Oxone® in aqueous solution under mild conditions at room temperature. The thus obtained 2-iodosobenzoic acids (IBAs) could be used as precursors of other cyclic organoiodine(III) derivatives by the solvolytic derivatization of the hydroxy group under mild conditions of 80 °C or lower temperature. These sequential procedures are highly reliable to selectively afford cyclic hypervalent iodine compounds in excellent yields without contamination by hazardous pentavalent iodine(III) compound.

scholarly journals Photocatalytic three-component asymmetric sulfonylation via direct C(sp3)-H functionalization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shi Cao ◽  
Wei Hong ◽  
Ziqi Ye ◽  
Lei Gong
Keyword(s):  
Asymmetric Catalysis ◽  
Organic Synthesis ◽  
Photochemical Reaction ◽  
Low Cost ◽  
Bioactive Molecules ◽  
Atom Economy ◽  
Mild Conditions ◽  
Wide Range ◽  
Unsaturated Carbonyl Compound ◽  
Direct Functionalization

AbstractThe direct and selective C(sp3)-H functionalization of cycloalkanes and alkanes is a highly useful process in organic synthesis owing to the low-cost starting materials, the high step and atom economy. Its application to asymmetric catalysis, however, has been scarcely explored. Herein, we disclose our effort toward this goal by incorporation of dual asymmetric photocatalysis by a chiral nickel catalyst and a commercially available organophotocatalyst with a radical relay strategy through sulfur dioxide insertion. Such design leads to the development of three-component asymmetric sulfonylation involving direct functionalization of cycloalkanes, alkanes, toluene derivatives or ethers. The photochemical reaction of a C(sp3)-H precursor, a SO2 surrogate and a common α,β-unsaturated carbonyl compound proceeds smoothly under mild conditions, delivering a wide range of biologically interesting α-C chiral sulfones with high regio- and enantioselectivity (>50 examples, up to >50:1 rr and 95% ee). This method is applicable to late-stage functionalization of bioactive molecules, and provides an appealing access to enantioenriched compounds starting from the abundant hydrocarbon compounds.

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