Author
Chengmei Ai
Bio: Chengmei Ai is an academic researcher from Nanchang University. The author has contributed to research in topics: Nucleophile & Aqueous solution. The author has an hindex of 2, co-authored 4 publications receiving 11 citations.
Papers
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6 citations
TL;DR: The novel SO2F2/H2O2/K2CO3 epoxidizing system is suitable to a variety of olefinic substrates including electron-rich and electron-deficient ones.
Abstract: An inexpensive, mild, and highly efficient epoxidation protocol has been developed involving bubbling SO2F2 gas into a solution of olefin, 30% aqueous hydrogen peroxide, and 4 N aqueous potassium c...
6 citations
TL;DR: In this paper, a mild and efficient method for deoxygenative C2-sulfonylation of quinoline N-Oxides in the presence of a base has been developed employing extremely inexpensive SO2F2 as an activator and sodium sulfinate as nucleophilic sulfonylation source.
4 citations
TL;DR: In this article, a highly efficient and selective oxidation of primary and tertiary amines employing SO2F2/H2O2/base system was described, where primary benzylamines were transformed into nitriles and secondary benzyamines were rearranged to amides.
3 citations
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Journal Article•
TL;DR: In this article, an efficient photocatalysts of copper nanoparticles on graphene support are successfully developed for controllably catalyzing the coupling reactions of aromatic nitro compounds to the corresponding azoxy or azo compounds under visible-light irradiation.
Abstract: Copper is a low-cost plasmonic metal. Efficient photocatalysts of copper nanoparticles on graphene support are successfully developed for controllably catalyzing the coupling reactions of aromatic nitro compounds to the corresponding azoxy or azo compounds under visible-light irradiation. The coupling of nitrobenzene produces azoxybenzene with a yield of 90 % at 60 °C, but azobenzene with a yield of 96 % at 90 °C. When irradiated with natural sunlight (mean light intensity of 0.044 W cm−2) at about 35 °C, 70 % of the nitrobenzene is converted and 57 % of the product is azobenzene. The electrons of the copper nanoparticles gain the energy of the incident light through a localized surface plasmon resonance effect and photoexcitation of the bound electrons. The excited energetic electrons at the surface of the copper nanoparticles facilitate the cleavage of the NO bonds in the aromatic nitro compounds. Hence, the catalyzed coupling reaction can proceed under light irradiation and moderate conditions. This study provides a green photocatalytic route for the production of azo compounds and highlights a potential application for graphene.
31 citations
TL;DR: A review of recent advances in iodine and its derivatives promoted hybridized C-S/N-S bonds formation and the future of this domain is prospected.
Abstract: Sulfur-containing scaffold, as a ubiquitous structural motif, has been frequently used in natural products, bioactive chemicals and pharmaceuticals, particularly C-S/N-S bonds are indispensable in many biological important compounds and pharmaceuticals. Development of mild and general methods for C-S/N-S bonds formation has great significance in modern research. Iodine and its derivatives have been recognized as inexpensive, environmentally benign and easy-handled catalysts or reagents to promote the construction of C-S/N-S bonds under mild reaction conditions, with good regioselectivities and broad substrate scope. Especially based on this, several new strategies, such as oxidation relay strategy, have been greatly developed and accelerated the advancement of this field. This review focuses on recent advances in iodine and its derivatives promoted hybridized C-S/N-S bonds formation. The features and mechanisms of corresponding reactions are summarized and the results of some cases are compared with those of previous reports. In addition, the future of this domain is discussed.
29 citations
TL;DR: In this article, the diversity-oriented synthesis of 1,2,4-triazols, 1,3, 4thiadiazols, and 1, 3, 4-selenadiazoles from N-tosylhydrazones was developed, and the reactions were general for a wide range of substrates, in which NH2CN, KOCN, KSCN, and KSeCN were used as odorless sources.
17 citations
TL;DR: In this paper, the authors summarize recent advances in multicomponent reactions involving sulfur components, which include elemental sulfur, sodium metabisulfite, sodium hyposulfite and other divalent, tetravalent and hexavalent organosulfur compounds.
Abstract: In recent years, multicomponent reactions with inorganic and organic sulfur compounds as one of reactants have achieved a remarkable development. In this review, we summarize recent advances in the multicomponent reactions involving sulfur components, which include elemental sulfur, sodium metabisulfite, sodium hyposulfite, potassium pyrosulfite, DABSO, sodium sulfide, thiocyanate, sulfur dioxide, carbon disulfide and other divalent, tetravalent and hexavalent organosulfur compounds.
11 citations
TL;DR: In this paper, an efficient epoxidation catalyst was prepared through the immobilization of Venturello anion, {PO4[W(O)(O2)2]4}3−, onto aminopropyl-modified porous activated carbon (AC).
Abstract: An efficient epoxidation catalyst was prepared through the immobilization of Venturello anion, {PO4[W(O)(O2)2]4}3−, onto aminopropyl-modified porous activated carbon (AC). First, the aminopropyl groups were anchored on the surface of AC by silylation with 3-aminopropyltriethoxysilane. Afterwards, electrostatic interaction between Venturello anions and ammonium groups located on the surface of AC produced the final catalyst. FT–IR spectroscopy, CHN elemental analysis, inductively coupled plasma optical emission spectroscopy, energy dispersive X-ray spectroscopy, and nitrogen adsorption–desorption analysis followed with BJH and BET calculations were used to characterize the prepared catalyst. Catalytic activity of the prepared catalyst was explored in epoxidation of different cyclic and terminal olefins with 30% H2O2 as green oxidant. The highest conversions were achieved for cyclooctene and cyclohexene due to the localization of higher electron density on their double bonds. The results revealed proper performance of the catalyst in epoxidation reaction with catalyst reusability for at least four times with no decrease in its activity.
9 citations