The Experts below are selected from a list of 1518 Experts worldwide ranked by ideXlab platform
Diego Alves - One of the best experts on this subject based on the ideXlab platform.
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ultrasound promoted organocatalytic enamine azide 3 2 cycloaddition reactions for the synthesis of arylselanyl phenyl 1h 1 2 3 triazol 4 yl ketones
Beilstein Journal of Organic Chemistry, 2017Co-Authors: Gabriel P Costa, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Rafael Luque, Juliano A Roehrs, Ricardo F Schumacher, Diego AlvesAbstract:The use of Sonochemistry is described in the organocatalytic enamine-azide [3 + 2] cycloaddition between 1,3-diketones and aryl azidophenyl selenides. These sonochemically promoted reactions were found to be amenable to a range of 1,3-diketones or aryl azidophenyl selenides, providing an efficient access to new ((arylselanyl)phenyl-1H-1,2,3-triazol-4-yl)ketones in good to excellent yields and short reaction times. In addition, this protocol was extended to β-keto esters, β-keto amides and α-cyano ketones. Selanyltriazoyl carboxylates, carboxamides and carbonitriles were synthesized in high yields at short times of reaction under very mild reaction conditions.
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Sonochemistry in organocatalytic enamine azide 3 2 cycloadditions a rapid alternative for the synthesis of 1 2 3 triazoyl carboxamides
Ultrasonics Sonochemistry, 2017Co-Authors: Daiane M Xavier, Bruna Goldani, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Marcio W Paixao, Rafael Luque, Diego AlvesAbstract:We described herein the use of Sonochemistry in the organocatalytic enamine-azide [3+2] cycloadditions of β-oxo-amides with a range of substituted aryl azides. These sonochemical promoted reactions were found to be amenable to a range of β-oxo amides or aryl azides, providing an efficient access to new N-aryl-1,2,3-triazoyl carboxamides in good to excellent yields and short times of reaction.
Timothy J. Mason - One of the best experts on this subject based on the ideXlab platform.
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Sonochemistry -a Proven Tool for Process Intensification
2020Co-Authors: Timothy J. MasonAbstract:ABSTRACT The global move towards developing environmentally friendlier preparations of chemical compounds and organic or inorganic materials should be accompanied by a saving of resources through the optimization of reaction conditions and/or the introduction of new processing technologies. Over the years Sonochemistry has been shown to be a green technology that can provide provide both a minimisation of energy use and efficient reaction control for industry.. Examples will be chosen from a number of fields which illustrate the wide ranging applicability of this technology in the chemical and processing industries and some practical applications which use high-power ultrasound will be reviewed
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some neglected or rejected paths in Sonochemistry a very personal view
Ultrasonics Sonochemistry, 2015Co-Authors: Timothy J. MasonAbstract:Sonochemistry is a very broad subject and nowadays it involves a wide range of disciplines and provides a forum for the cross-fertilization of ideas. In the early days this was not quite the situation and so a number of ideas that came forward were outside of main-line classical thinking in science. These concepts were often rejected out of hand and sometimes even ridiculed. This paper revisits some of these ideas for those of you who might be interested in the more unusual effects in Sonochemistry.
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new evidence for the inverse dependence of mechanical and chemical effects on the frequency of ultrasound
Ultrasonics Sonochemistry, 2011Co-Authors: Timothy J. Mason, Andrew J Cobley, John E Graves, David J MorganAbstract:Acoustic cavitation has been the subject of research and discussion for many years and it is the underlying driving force for Sonochemistry. The collapse of acoustic cavitation bubbles in water near to a surface can bring about significant surface modification in terms of the mechanical damage caused by the asymmetric collapse of the bubbles which cause erosion and abrasion. A second effect of acoustic cavitation is the formation of short lived radicals caused by the breakdown of water inside the bubble. For the first time the dependence of these effects has been observed on the surface of a plastic material as a function of ultrasonic frequency.
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Sonochemistry and sonoprocessing the link the trends and probably the future
Ultrasonics Sonochemistry, 2003Co-Authors: Timothy J. MasonAbstract:Abstract Traditionally the community of scientists involved with ultrasound has been divided broadly into those who use it as a measurement device with no effect on the medium (high frequency low power ultrasound e.g. non-destructive testing) and those who use it to produce physical or chemical effects in a medium (higher power low frequency ultrasound e.g. Sonochemistry). Divisions also exist within the broad spectrum of those involved with the latter. In the early days of Sonochemistry this did not prove to be a major problem, the subject was new and the field was expanding within the chemistry community. However at a point some years ago Jean-Louis Luche made the very important observation that Sonochemistry applications could be subdivided into reactions which were the result of “true” and “false” effects [Synthetic Organic Chemistry by J.-L. Luche, 1998, p. 376]. Essentially these terms referred to real chemical effects induced by cavitation and those effects that could be mainly ascribed to the mechanical impact of bubble collapse. These mechanical effects have not held the interest of synthetic chemists as much as the so-called true ones but nevertheless they are certainly important in areas such as processing. In this paper I will attempt to show that there are links that can be made across many of the ultrasound “disciplines” and that these links can only serve to strengthen research in the general area of power ultrasound. If research on power ultrasound is strong then research into “pure” Sonochemistry will also flourish and “false” Sonochemistry will be born again as a significant research area.
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Applied Sonochemistry: The Uses of Power Ultrasound in Chemistry and Processing
2002Co-Authors: Timothy J. Mason, J.p. LorimerAbstract:Introduction to Applied Ultrasonics. General Principles. Synthesis. Sonochemistry in Environmental Protection and Remediation. Polymers. Sonoelectrochemistry. Ultrasonic Equipment and Chemical Reactor Design. Subject Index.
Natalia Seus - One of the best experts on this subject based on the ideXlab platform.
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ultrasound promoted organocatalytic enamine azide 3 2 cycloaddition reactions for the synthesis of arylselanyl phenyl 1h 1 2 3 triazol 4 yl ketones
Beilstein Journal of Organic Chemistry, 2017Co-Authors: Gabriel P Costa, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Rafael Luque, Juliano A Roehrs, Ricardo F Schumacher, Diego AlvesAbstract:The use of Sonochemistry is described in the organocatalytic enamine-azide [3 + 2] cycloaddition between 1,3-diketones and aryl azidophenyl selenides. These sonochemically promoted reactions were found to be amenable to a range of 1,3-diketones or aryl azidophenyl selenides, providing an efficient access to new ((arylselanyl)phenyl-1H-1,2,3-triazol-4-yl)ketones in good to excellent yields and short reaction times. In addition, this protocol was extended to β-keto esters, β-keto amides and α-cyano ketones. Selanyltriazoyl carboxylates, carboxamides and carbonitriles were synthesized in high yields at short times of reaction under very mild reaction conditions.
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Sonochemistry in organocatalytic enamine azide 3 2 cycloadditions a rapid alternative for the synthesis of 1 2 3 triazoyl carboxamides
Ultrasonics Sonochemistry, 2017Co-Authors: Daiane M Xavier, Bruna Goldani, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Marcio W Paixao, Rafael Luque, Diego AlvesAbstract:We described herein the use of Sonochemistry in the organocatalytic enamine-azide [3+2] cycloadditions of β-oxo-amides with a range of substituted aryl azides. These sonochemical promoted reactions were found to be amenable to a range of β-oxo amides or aryl azides, providing an efficient access to new N-aryl-1,2,3-triazoyl carboxamides in good to excellent yields and short times of reaction.
Raquel G Jacob - One of the best experts on this subject based on the ideXlab platform.
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ultrasound promoted organocatalytic enamine azide 3 2 cycloaddition reactions for the synthesis of arylselanyl phenyl 1h 1 2 3 triazol 4 yl ketones
Beilstein Journal of Organic Chemistry, 2017Co-Authors: Gabriel P Costa, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Rafael Luque, Juliano A Roehrs, Ricardo F Schumacher, Diego AlvesAbstract:The use of Sonochemistry is described in the organocatalytic enamine-azide [3 + 2] cycloaddition between 1,3-diketones and aryl azidophenyl selenides. These sonochemically promoted reactions were found to be amenable to a range of 1,3-diketones or aryl azidophenyl selenides, providing an efficient access to new ((arylselanyl)phenyl-1H-1,2,3-triazol-4-yl)ketones in good to excellent yields and short reaction times. In addition, this protocol was extended to β-keto esters, β-keto amides and α-cyano ketones. Selanyltriazoyl carboxylates, carboxamides and carbonitriles were synthesized in high yields at short times of reaction under very mild reaction conditions.
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Sonochemistry in organocatalytic enamine azide 3 2 cycloadditions a rapid alternative for the synthesis of 1 2 3 triazoyl carboxamides
Ultrasonics Sonochemistry, 2017Co-Authors: Daiane M Xavier, Bruna Goldani, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Marcio W Paixao, Rafael Luque, Diego AlvesAbstract:We described herein the use of Sonochemistry in the organocatalytic enamine-azide [3+2] cycloadditions of β-oxo-amides with a range of substituted aryl azides. These sonochemical promoted reactions were found to be amenable to a range of β-oxo amides or aryl azides, providing an efficient access to new N-aryl-1,2,3-triazoyl carboxamides in good to excellent yields and short times of reaction.
Thiago Barcellos - One of the best experts on this subject based on the ideXlab platform.
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ultrasound promoted organocatalytic enamine azide 3 2 cycloaddition reactions for the synthesis of arylselanyl phenyl 1h 1 2 3 triazol 4 yl ketones
Beilstein Journal of Organic Chemistry, 2017Co-Authors: Gabriel P Costa, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Rafael Luque, Juliano A Roehrs, Ricardo F Schumacher, Diego AlvesAbstract:The use of Sonochemistry is described in the organocatalytic enamine-azide [3 + 2] cycloaddition between 1,3-diketones and aryl azidophenyl selenides. These sonochemically promoted reactions were found to be amenable to a range of 1,3-diketones or aryl azidophenyl selenides, providing an efficient access to new ((arylselanyl)phenyl-1H-1,2,3-triazol-4-yl)ketones in good to excellent yields and short reaction times. In addition, this protocol was extended to β-keto esters, β-keto amides and α-cyano ketones. Selanyltriazoyl carboxylates, carboxamides and carbonitriles were synthesized in high yields at short times of reaction under very mild reaction conditions.
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Sonochemistry in organocatalytic enamine azide 3 2 cycloadditions a rapid alternative for the synthesis of 1 2 3 triazoyl carboxamides
Ultrasonics Sonochemistry, 2017Co-Authors: Daiane M Xavier, Bruna Goldani, Natalia Seus, Raquel G Jacob, Thiago Barcellos, Marcio W Paixao, Rafael Luque, Diego AlvesAbstract:We described herein the use of Sonochemistry in the organocatalytic enamine-azide [3+2] cycloadditions of β-oxo-amides with a range of substituted aryl azides. These sonochemical promoted reactions were found to be amenable to a range of β-oxo amides or aryl azides, providing an efficient access to new N-aryl-1,2,3-triazoyl carboxamides in good to excellent yields and short times of reaction.
