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5 results on '"Zhan-Ling Cheng"'

1. Chemistry of Difluorocarbene: Synthesis and Conversion of Difluoro(methylene)cyclopropanes

Author

Qing-Yun Chen, Chao Liu, Ji-Chang Xiao, and Zhan-Ling Cheng

Subjects
chemistry.chemical_compound, Reaction mechanism, chemistry, Difluorocarbene, Organic Chemistry, Electrophile, Organic chemistry, General Medicine, Physical and Theoretical Chemistry, Methylene, Medicinal chemistry, Cyclopropane
Abstract

Difluoro(methylene)cyclopropanes (F2MCPs) were prepared directly by difluorocarbene addition to allenes, and the resulting F2MCPs were converted into a variety of difluoro(methylene)cyclopropane derivatives through Heck reactions and electrophilic substitutions. The ring-opening reactions of F2MCPs with I2 are reported and a plausible reaction mechanism is also discussed. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

Published
2007

2. Difluorocarbene Chemistry: A Simple Transformation of 3,3-gem-Difluorocyclopropenes to Cyclopropenones

Author

Zhan‐Ling Cheng and Qing-Yun Chen

Subjects
Hydrolysis, chemistry.chemical_compound, Difluorocarbene, chemistry, Polymer chemistry, Organic chemistry, General Chemistry, Cyclopropenone, General Medicine, Decomposition, Cycloaddition, Catalysis
Abstract

The cycloaddition reactions of α-acetyoxyl propynes with difluorocarbene, generated from the decomposition of FSO2CF2CO2SiMe3 in DG in the presence of 10% of NaF at 120 °C gave readily α-acetyoxyl gem-difluorocyclopropenes. When these fluorinated compounds were hydrolyzed under alkaline condition at 0 °C, α-hydroxyl cyclopropenones were produced predominantly whereas treated with catalytic amounts of BF3·Et2O in Et2O, α-acetyoxyl cyclopropenones were obtained.

Published
2007

3. Chemistry of Difluorocarbene Adducts: Stereospecific Synthesis of Conjugated Fluoroolefins and 1,3-Azabutadienes from gem-Difluorocyclopropenyl Ketones

Author

Qing-Yun Chen and Zhan-Ling Cheng

Subjects
endocrine system diseases, Difluorocarbene, Organic Chemistry, General Medicine, Conjugated system, Biochemistry, Medicinal chemistry, Adduct, Inorganic Chemistry, chemistry.chemical_compound, Malonate, Stereospecificity, chemistry, Environmental Chemistry, Organic chemistry, Amine gas treating, Physical and Theoretical Chemistry
Abstract

Treatment of gem-difluorocyclopropenyl ketones with malonate anion, amine gave stereospecifically conjugated fluoroolefins and azabutadienes, respectively.

Published
2006

4. Difluorocarbene Chemistry: Synthesis of gem-Difluorocyclopropenyl Ketones and gem-Difluorinated Dihydrofurans

Author

Qing-Yun Chen and Zhan-Ling Cheng

Subjects
Potassium carbonate, chemistry.chemical_compound, Aqueous solution, Difluorocarbene, chemistry, Organic chemistry, General Medicine, Decomposition, Cycloaddition
Abstract

The cycloaddition reactions of difluorocarbene, generated by the decomposition of FSO 2 CF 2 CO 2 SiMe 3 , with α,β-acetylenic ketones give gem-difluorocyclopropenyl ketones in good yields. Treatment of these gem-difluorocyclopropenyl ketones with aqueous potassium carbonate results in the formation of gem-difluorinated dihydrofurans.

Published
2006

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