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3. A new reagent pair sodium percarbonateacetic anhydride for epoxidation of olefins

Author

Gao-Yang Xie, Yun-Zhi Lu, Guan-Zhong Sun, Lin-Xiao Xu, Fenggang Tao, and Shi-Ming Ma

Subjects
Acetic anhydride, chemistry.chemical_compound, chemistry, Reagent, Sonication, Sodium, Organic chemistry, chemistry.chemical_element, General Chemistry, Sodium percarbonate, Sodium perborate
Abstract

A new convenient method for epoxidation of olefins by sodium percarbonate — acetic anhydride is reported. It is found that the epoxides in 60–80% yields can be obtained in 18–24 h without ultrasonication. However, higher yields (some nearly quantitative) can be reached only within 1–3 h under ultrasonication. A comparison between the ultrasonicated epoxidations by use of sodium percarbonate and sodium perborate is also made. The experimental results have revealed that ultrasonication plays a main role in accelerating the interaction of both sodium percarbonate and sodium perborate with acetic anhydride, but it does not alter the mechanism of these two epoxidations.

Published
1989

4. A reapproach to the generation and reaction mechanism of cyclopropylidenes

Author

Feng‐Gang Tao, Tong‐Yin Yu, Hang Shen Xiao, and Lin‐Xiao Xu

Subjects
chemistry.chemical_classification, Reaction mechanism, endocrine system diseases, Physics::Instrumentation and Detectors, Chemistry, chemistry.chemical_element, General Chemistry, Ring (chemistry), Photochemistry, Organic reaction, Intramolecular force, Elementary reaction, Lithium, Physics::Chemical Physics, Nuclear Experiment, Alkyl
Abstract

By the comparison of the reaction products of gem-dihalocyclopropanes under various conditions, it is suggested that similar to the reactions with metals, the reactive radical intermediates which make the reaction results complicated are formed in the reactions of gem-dihalocyclopropanes with alkyl lithium. Studies on the competitions between ring opening and intramolecular C—H insertions of cyclopropylidenes generated by the reactions of gem-dihalocyclopropanes with metals and discussions on the reaction mechanism are also given in this paper.

Published
1989

5. ChemInform Abstract: Sodium Perborate Oxidations of Cyclic and Acyclic Alkenes to Oxiranes or Vicinal Acetoxy Alcohols

Author

Gao-Yang Xie, Jun Hu, Fenggang Tao, Shining Ma, Lin-Xiao Xu, and Wei Hou

Subjects
Reaction conditions, Acetic anhydride, chemistry.chemical_compound, Chemistry, Organic chemistry, General Medicine, Sodium perborate, Vicinal
Abstract

Under different reaction conditions, sodium perborate/acetic anhydride oxidizes alkenes into oxiranes or vicinal acetoxy alcohols in good yields.

Published
1988

10. Sodium perborate oxidations of cyclic and acyclic alkenes to oxiranes or vicinal acetoxy alcohols

Author

Gao-Yang Xie, Lin-Xiao Xu, Jun Hu, Wei Hou, Shining Ma, and Fenggang Tao

Subjects
chemistry.chemical_classification, Bicyclic molecule, Organic Chemistry, Cyclohexene, Epoxide, Biochemistry, Styrene, chemistry.chemical_compound, Acetic anhydride, Hydrocarbon, chemistry, Drug Discovery, Organic chemistry, Sodium perborate, Vicinal
Abstract

Under different reaction conditions, sodium perborate/acetic anhydride oxidizes alkenes into oxiranes or vicinal acetoxy alcohols in good yields.

Published
1988

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