Base dependent 1,3-dithioacetals rearrangement over sulfoxidation under visible-light photocatalysis to access disulfide-linked-dithioesters

Base dependent oxidative rearrangement of dithiolanes and dithianes to access disulfide-linked-dithioesters under visible-light photoredox catalytic conditions has been disclosed. The protocol demonstrated the ability to synthesize either rearranged product or sulfoxide by simply switching the base with inherent ability to make hydrogen bonding with sulfur atom. Unlike, the usual deprotection of thioacetals to corresponding aldehydes under the oxidative conditions, we observed the unique regioselective oxidative reactivity of thioacetals to form disulfide-linked-dithioester or sulfoxides. The generality of the protocol has been demonstrated by exploring a wide range of substrates. As an application the in-situ generated thyil radical has been trapped with disulfides to prepare hetro-disulfides of potential utility. The protocol proved to be practical on gram scale quantity and relied on clean energy source for the transformation. Based on the series of control experiments, cyclic volametry and Stern-Volmer studies the plausible mechanism has been proposed.

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A Review of Corrosion Resistance Alloy Weld Overlay Cladding Material for Geothermal Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1047.120 ◽

2021 ◽

Vol 1047 ◽

pp. 120-127

Author(s):

Reylina Garcia Tayactac ◽

Edward B.O. Ang

Keyword(s):

Corrosion Resistance ◽

Alloy Steel ◽

Operating Cost ◽

Cost Savings ◽

Clean Energy ◽

Maximum Output ◽

Solid Alloy ◽

Wide Range ◽

Heat Extremes ◽

Clean Energy Source

Geothermal is known as renewable energy and a clean energy source but inherent properties make this energy clean. Minerals and deposits in geothermal reservoirs create a scale that is persistent in its corrosive nature. In addition, heat extremes and pressure variations present challenges to the integrity of the wellhead components and the downhole casing. Such challenges need to be mitigated to achieve maximum output from these aging or even newly commissioned wells. The geothermal power industry has reported a wide range of corrosion problems. Given the highly corrosive conditions to be treated in the geothermal sector and the benefits of reduced unplanned downtime, operating cost savings would be expected if more CRAs clad products were used. In many cases, only the material's surface requires corrosion resistance and carbon or alloy steel can be clad with a more corrosion-resistant alloy. Up to 80% of the cost of using solid alloy can be saved by cladding. Carbon or low-alloy steel cladding can be carried out by overlay welding. This paper reviews available literature on corrosion in the geothermal environment and presents the successful use of clad products in other industries to support the rising demand for Philippine geothermal applications.

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In situ synthesis of a C-doped (BiO)2CO3 hierarchical self-assembly effectively promoting visible light photocatalysis

Journal of Materials Chemistry A ◽

10.1039/c5ta00103j ◽

2015 ◽

Vol 3 (11) ◽

pp. 6118-6127 ◽

Cited By ~ 83

Author(s):

Ting Xiong ◽

Hongwei Huang ◽

Yanjuan Sun ◽

Fan Dong

Keyword(s):

Photocatalytic Activity ◽

Structural Optimization ◽

Visible Light ◽

Self Assembly ◽

In Situ Synthesis ◽

Carbon Doping ◽

Visible Light Photocatalysis ◽

Visible Photocatalytic Activity

By combination of carbon doping and structural optimization, C-doped (BiO)2CO3 microspheres exhibited highly enhanced and stable visible photocatalytic activity.

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Improved anti-biofouling performance of CdS/g-C3N4/rGO modified membranes based on in situ visible light photocatalysis in anammox membrane bioreactor

Journal of Membrane Science ◽

10.1016/j.memsci.2020.118861 ◽

2020 ◽

pp. 118861

Author(s):

Lingfeng Ni ◽

Yijing Zhu ◽

Jie Ma ◽

Min Wu ◽

Han Wang ◽

...

Keyword(s):

Visible Light ◽

Membrane Bioreactor ◽

Visible Light Photocatalysis

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Energy Willow From Experimental Plantation as a Potentially Clean Energy Source

Ecological Chemistry and Engineering S ◽

10.1515/eces-2017-0013 ◽

2017 ◽

Vol 24 (2) ◽

pp. 203-212 ◽

Cited By ~ 1

Author(s):

Monika Janas ◽

Alicja Zawadzka

Keyword(s):

Heavy Metals ◽

Combustion Process ◽

Production Capacity ◽

Calorific Value ◽

Absorption Spectrometry ◽

Clean Energy ◽

Heat Of Combustion ◽

Wide Range ◽

Close Relationship ◽

Clean Energy Source

Abstract Energy willow as a species with broad adaptation possibilities, large production capacity and a wide range of applications, takes a special place among the plants grown for energy production. In this work an analysis was conducted in respect of the usefulness of this type of wood from experimental plantations as a clean source of energy generated in the combustion process. The heat of combustion and net calorific value of dry matter of energy willow wood, including selected sorts and classes of thickness were determined. Energy willow has a natural ability to accumulate heavy metals which are oxidized during the combustion process or remain in the ash, and consequently repollute the environment. In order to determine the environmental impact the content of heavy metals was examined in energy willow wood and in the soil of the experimental plantation. Metal concentrations were determined by the Atomic Absorption Spectrometry method (AAS). Results of the tests confirmed a close relationship between the heat of combustion, calorific value and wood thickness as well as its location in the tree structure. Furthermore, very large differences were found in the content of heavy metals in the samples of both willow wood and soil. The levels of heavy metal content in the wood of energy willow determine the agricultural use of ashes produced during combustion.

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Straightforward synthesis of quinazolin-4(3H)-ones via visible light-induced condensation cyclization

RSC Advances ◽

10.1039/d1ra07944a ◽

2022 ◽

Vol 12 (3) ◽

pp. 1494-1498

Author(s):

Wuji Sun ◽

Xue Ma ◽

Yuqi Pang ◽

Lifeng Zhao ◽

Qidi Zhong ◽

...

Keyword(s):

Energy Source ◽

Visible Light ◽

Functional Group ◽

Clean Energy ◽

Metal Catalyst ◽

Catalyst Free ◽

Clean Energy Source

Visible light was used as a readily available and renewable clean energy source for the green and metal catalyst free synthesis of quinazolin-4(3H)-ones. High and excellent yields of the desired products were obtained with good functional group tolerance.

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Hierarchical Cu2S nanorods with different crystal phases for asymmetrical supercapacitors and visible-light photocatalysis

Dalton Transactions ◽

10.1039/c8dt03794a ◽

2018 ◽

Vol 47 (42) ◽

pp. 15189-15196 ◽

Cited By ~ 8

Author(s):

Qun Liu ◽

Xiaodan Hong ◽

Xin Zhang ◽

Xingyan You ◽

Xin Zhao ◽

...

Keyword(s):

Visible Light ◽

Catalytic Performance ◽

Electrochemical Activity ◽

Visible Light Photocatalysis ◽

Hexagonal Crystal ◽

Crystal Phases ◽

Excellent Catalytic Performance

Hierarchical structured Cu2S nanorods with monoclinic and hexagonal crystal phases are in situ grown on copper sheets, showing remarkable electrochemical activity in supercapacitors and excellent catalytic performance in photocatalysis.

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