The Experts below are selected from a list of 28728 Experts worldwide ranked by ideXlab platform
Wenge Cui - One of the best experts on this subject based on the ideXlab platform.
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Diels−Alder Reactions of Quinol Lactones: A Change of Regioselectivity with Stannic Chloride Catalysis
The Journal of organic chemistry, 2002Co-Authors: George A. Kraus, Wenge CuiAbstract:Lewis acid-mediated Diels-Alder reactions of quinol lactone 2 gave regioselectivity opposite to that of the uncatalyzed reaction. Compound 12 is proposed as the Reactive Intermediate generated by the reaction of 2 with stannic chloride.
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diels alder reactions of quinol lactones a change of regioselectivity with stannic chloride catalysis
Journal of Organic Chemistry, 2002Co-Authors: George A. Kraus, Wenge CuiAbstract:Lewis acid-mediated Diels-Alder reactions of quinol lactone 2 gave regioselectivity opposite to that of the uncatalyzed reaction. Compound 12 is proposed as the Reactive Intermediate generated by the reaction of 2 with stannic chloride.
Xinyan Wang - One of the best experts on this subject based on the ideXlab platform.
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N-Sulfonyl acetylketenimine as a highly Reactive Intermediate for synthesis of N-Aroylsulfonamides
Tetrahedron, 2019Co-Authors: Weiguang Yang, Dayun Huang, Xiaobao Zeng, Jianlan Zhang, Xinyan WangAbstract:Abstract A highly Reactive Intermediate N-sulfonyl acetylketenimine was generated from an ynone-participated CuAAC/ring-opening method. Its unique structure allowed it to react with aryl carboxylic acids to give N-aroylsulfonamides via a novel Mumm-type rearrangement.
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n sulfonyl acetylketenimine as a highly Reactive Intermediate for the synthesis of n sulfonyl amidines
Chemical Communications, 2018Co-Authors: Weiguang Yang, Dayun Huang, Xiaobao Zeng, Dongping Luo, Xinyan WangAbstract:A highly Reactive Intermediate N-sulfonyl acetylketenimine was generated from a 3-butyn-2-one participating CuAAC/ring-opening method. Its high reactivity due to bearing two EWGs allowed us to offer the first example of a reaction between ketenimine and amide to synthesize N-sulfonyl amidines efficiently.
Peter R Ogilby - One of the best experts on this subject based on the ideXlab platform.
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singlet oxygen as a Reactive Intermediate in the photodegradation of phenylenevinylene oligomers
Chemistry of Materials, 1999Co-Authors: Niels Dam, Rodger D Scurlock, Bojie Wang, And Mikael Sundahl, Peter R OgilbyAbstract:Singlet molecular oxygen (a1Δg) is shown to be the principal Reactive Intermediate in the photoinduced oxygen-dependent decomposition of a series of phenylenevinylene oligomers. The reaction rate between singlet oxygen and the oligomer decreases (1) with a decrease in the extent of phenylenevinylene conjugation (i.e., oligomer chain length) and (2) upon the incorporation of electron-withdrawing substituents on the oligomer. The reaction rate, however, does not appear to depend solely on the electron density of the oligomer π system, as calculated using ab initio methods. For oligomers with vinyl-substituted cyano group(s), the reaction with singlet oxygen is very slow, thus making such compounds good candidates for the production of stable electroluminescent materials.
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singlet oxygen as a Reactive Intermediate in the photodegradation of an electroluminescent polymer
Journal of the American Chemical Society, 1995Co-Authors: Rodger D Scurlock, Bojie Wang, Peter R Ogilby, James R Sheats, R L CloughAbstract:Singlet molecular oxygen (a{sup 1}{Delta}{sub g}) is shown to be a Reactive Intermediate in the photoinduced oxidative decomposition of the electroluminescent material poly(2,5-bis(5,6-dihydrocholestanoxy)-1,4-phenylenevinylene) [BCHA-PPV] in both liquid solutions and solid films. Upon irradiation of this polymer in CS{sub 2}, singlet oxygen is produced by energy transfer from the BCHA-PPV triplet state to ground state oxygen with a quantum yield of nearly 0.025. Singlet oxygen reacts with BCHA-PPV, resulting in extensive chain scission of the macromolecule. The reaction with singlet oxygen is unique to the polymer; the monomeric analog of this system, stilbene, does not appreciably react with singlet oxygen. Polymer degradation is proposed to proceed via addition of singlet oxygen in a{sub {pi}} 2+{sub {pi}}2 cycloaddition reaction to the double bond that connects phenylene groups in the macromolecule. 60 refs., 6 figs.
George A. Kraus - One of the best experts on this subject based on the ideXlab platform.
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Diels−Alder Reactions of Quinol Lactones: A Change of Regioselectivity with Stannic Chloride Catalysis
The Journal of organic chemistry, 2002Co-Authors: George A. Kraus, Wenge CuiAbstract:Lewis acid-mediated Diels-Alder reactions of quinol lactone 2 gave regioselectivity opposite to that of the uncatalyzed reaction. Compound 12 is proposed as the Reactive Intermediate generated by the reaction of 2 with stannic chloride.
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diels alder reactions of quinol lactones a change of regioselectivity with stannic chloride catalysis
Journal of Organic Chemistry, 2002Co-Authors: George A. Kraus, Wenge CuiAbstract:Lewis acid-mediated Diels-Alder reactions of quinol lactone 2 gave regioselectivity opposite to that of the uncatalyzed reaction. Compound 12 is proposed as the Reactive Intermediate generated by the reaction of 2 with stannic chloride.
Rodger D Scurlock - One of the best experts on this subject based on the ideXlab platform.
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singlet oxygen as a Reactive Intermediate in the photodegradation of phenylenevinylene oligomers
Chemistry of Materials, 1999Co-Authors: Niels Dam, Rodger D Scurlock, Bojie Wang, And Mikael Sundahl, Peter R OgilbyAbstract:Singlet molecular oxygen (a1Δg) is shown to be the principal Reactive Intermediate in the photoinduced oxygen-dependent decomposition of a series of phenylenevinylene oligomers. The reaction rate between singlet oxygen and the oligomer decreases (1) with a decrease in the extent of phenylenevinylene conjugation (i.e., oligomer chain length) and (2) upon the incorporation of electron-withdrawing substituents on the oligomer. The reaction rate, however, does not appear to depend solely on the electron density of the oligomer π system, as calculated using ab initio methods. For oligomers with vinyl-substituted cyano group(s), the reaction with singlet oxygen is very slow, thus making such compounds good candidates for the production of stable electroluminescent materials.
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singlet oxygen as a Reactive Intermediate in the photodegradation of an electroluminescent polymer
Journal of the American Chemical Society, 1995Co-Authors: Rodger D Scurlock, Bojie Wang, Peter R Ogilby, James R Sheats, R L CloughAbstract:Singlet molecular oxygen (a{sup 1}{Delta}{sub g}) is shown to be a Reactive Intermediate in the photoinduced oxidative decomposition of the electroluminescent material poly(2,5-bis(5,6-dihydrocholestanoxy)-1,4-phenylenevinylene) [BCHA-PPV] in both liquid solutions and solid films. Upon irradiation of this polymer in CS{sub 2}, singlet oxygen is produced by energy transfer from the BCHA-PPV triplet state to ground state oxygen with a quantum yield of nearly 0.025. Singlet oxygen reacts with BCHA-PPV, resulting in extensive chain scission of the macromolecule. The reaction with singlet oxygen is unique to the polymer; the monomeric analog of this system, stilbene, does not appreciably react with singlet oxygen. Polymer degradation is proposed to proceed via addition of singlet oxygen in a{sub {pi}} 2+{sub {pi}}2 cycloaddition reaction to the double bond that connects phenylene groups in the macromolecule. 60 refs., 6 figs.
