- Preparation and morphology of ring-shaped polystyrene-block-polyisoprenes
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Three polystyrene-block-polyisoprene-block-polystyrenes (SIS) with different compositions were prepared and cyclized by the coupling reaction between two end groups on the same molecules. Ring-shaped polystyrene-block-polyisoprenes (SI) were isolated from
- Takano, Atsushi,Kadoi, Osamu,Hirahara, Kazuhiro,Kawahara, Seiichi,Isono, Yoshinobu,Suzuki, Jiro,Matsushita, Yushu
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- Electrochemically Enabled Carbohydroxylation of Alkenes with H2O and Organotrifluoroborates
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Unprecedented hydroxy-alkynylation and -alkenylation reactions of arylalkenes have been developed through electrochemically enabled addition of an organotrifluoroborate reagent and H2O across the double bond of the alkene. The use of electrochemistry to promote these oxidative alkene 1,2-difunctionalization reactions not only obviates the need for transition-metal catalysts and oxidizing reagents but also ensures high regio- and chemoselectivity to afford homopropargylic or homoallylic alcohols. The possibility of extending the electrochemical alkene difunctionalization strategy to other alkene carbo-heterofunctionalization reactions has been demonstrated.
- Xiong, Peng,Long, Hao,Song, Jinshuai,Wang, Yaohui,Li, Jian-Feng,Xu, Hai-Chao
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supporting information
p. 16387 - 16391
(2018/11/23)
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- Metal-free oxidative cross-coupling of diazirines with arylboronic acids
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We report herein a metal-free cross-coupling of diazirines with arylboronic acids under oxidative conditions. The reaction affords a series of substituted olefins. It is proposed that the interaction between the nitrogen on diazirine with arylboronic acid plays a key role in this transformation.
- Wu, Guojiao,Zhao, Xia,Ji, Wenzhi,Zhang, Yan,Wang, Jianbo
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p. 1961 - 1963
(2016/02/05)
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- Electrophilic Fluorophosphonium Cations in Frustrated Lewis Pair Hydrogen Activation and Catalytic Hydrogenation of Olefins
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The combination of phosphorus(V)-based Lewis acids with diaryl amines and diaryl silylamines promotes reversible activation of dihydrogen and can be further exploited in metal-free catalytic olefin hydrogenation. Combined experimental and density functional theory (DFT) studies suggest a frustrated Lewis pair type activation mechanism. FLP hydrogenation: The combination of a phosphorus(V)-based Lewis acid with diaryl amines or diaryl silylamines promotes reversible activation of dihydrogen and can be further exploited in metal-free catalytic olefin hydrogenation. Combined experimental and density functional theory (DFT) studies suggest a frustrated Lewis pair (FLP)-type activation mechanism.
- Vom Stein, Thorsten,Perz, Manuel,Dobrovetsky, Roman,Winkelhaus, Daniel,Caputo, Christopher B.,Stephan, Douglas W.
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supporting information
p. 10178 - 10182
(2015/09/01)
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- 4,5-DIHYDRO-OXAZOL-2-YL AMINE DERIVATIVES
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The present invention relates to a compounds of formula I wherein R1, R1′, R2, R3, R4, X, Ar, and m are as defined in the specification and claims and pharmaceutically active acid addition salts thereof. Compounds of the invention have Asp2 (β-secretase, BACE 1 or Memapsin-2) inhibitory activity and are useful for the treatment of diseases characterized by elevated β-amyloid levels or β-amyloid deposits, particularly Alzheimer's disease.
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Page/Page column 9
(2009/09/05)
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- Highly asymmetric dihydroxylation of 1-aryl-1'-pyridyl alkenes
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The asymmetric dihydroxylation of 1-aryl-1'-pyridyl alkenes afforded the diols in high yield and excellent enantioselectivity. (C) 2000 Published by Elsevier Science Ltd.
- Wang, Xin,Zak, Mark,Maddess, Mathew,O'Shea, Paul,Tillyer, Richard,Grabowski,Reider, Paul J.
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p. 4865 - 4869
(2007/10/03)
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