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Markovnikov addition of vinyl acetate with azoles catalyzed by potassium tert-butoxide

Chinese Chemical Letters 2011年第4期22卷 417-420页

作者： Mazaahir Kidwai Neeraj Kumar Mishra Anwar Jahan Green Chemistry Research Laboratory Department of ChemistryUniversity of DelhiDelhi-110007India

A simple and efficient methodology for Markovnikov addition of azoles with vinyl acetate catalyzed by potassium tert-butoxide is described.N-heterocyclic compounds are synthesized from simple and commercially availabl... 详细信息

关键词： Markovnikov addition potassium tert-butoxide N-Heterocyclic compounds

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A mild and highly efficient one-pot three-component reaction for carbon-sulfur bond formation catalyzed by potassium tert-butoxide

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Chinese Chemical Letters 2011年第10期22卷 1179-1182页

作者： Barahman Movassagh Amir Rakhshani Department of Chemistry K.N.Toosi University of TechnologyP.O.Box 16315-1618TehranIran

potassium tert-butoxide has been found to be a highly efficient catalyst for one-pot,three-component reaction of aryl aldehydes, acetophenones,and thiols via Claisen-Schmidt/Michael addition reactions for the synthesis of thia-Michael adducts in high yields. The reactions are best carried out in tert-butyl alcohol at room temperature.

关键词： potassium tert-butoxide Thia-Michael adduct Three-component reaction C-S bond formation Thiols

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Synthesis of Block Copolymers of 2-Ethylhexyl Methacrylate, n-Hexyl Methacrylate and Methyl Methacrylate via Anionic Polymerization at Ambient Temperature

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Chinese Journal of Chemistry 2018年第10期36卷 934-938页

作者： Guijin Zou Anna Zheng Dafu wei Zheng Li Ling Su Tongyuan Zhang Xiang Xu Yong Guan School of Materials Science and Engineering Key Laboratory for Ultrafine Materials of Ministry of Education East China University of Science andTechnology Shanghai 200237 China

It still remains a concern to break through the bottlenecks of anionic polymerization of polar monomers, such as side reactions, low conver- sion and low temperature （-78 ℃）. In this work, potassium tert-butoxide （t-BuOK） was chosen to initiate the anionic polymerization of 2-ethylhexyl methacrylate （EHMA） in tetrahydrofuran. The conversions were above 99% at 0 or 30 ℃, and above 95% at 60 ℃ without side reaction inhibitors. The high conversions implied t-BuOK could suppress the side reactions. A series of block copolymers of EHMA, n-hexyl methacrylate （HMA） and methyl methacrylate （MMA） were further synthesized at 0 ℃, and the conversions were all above 99%. The GPC and IH NMR results confirmed the successful synthesis of the block copolymers. The molecular size of monomer and the state of t-BuOK （free ion pairs or aggregates） remarkably affected the polymerization rates and the molecular structures of the products. The DMA results indicated that the glass transition temperatures of PEHMA or PHMA block and PMMA block were 20 ℃ and 60 ℃, respectively, which deviated from -2 ℃ and 105 ℃ of homopolymer, respectively, due to the partial com- patibility of the blocks. This work explored a route of the anionic polymerization of polar monomers at room temperature.

关键词： anionic polymerization methacrylate polar monomer potassium tert-butoxide

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