- Visible-Light-Induced Carbo-2-pyridylation of Electron-Deficient Alkenes with Pyridinium Salts
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A simple and practical visible-light-induced carbo-2-pyridylation of electron-deficient alkenes with readily available N-benzoylmethylpyridinium bromides is reported. More than 40 examples are presented and proceed in greater than 80 % yield (on average)
- Hu, Rong-Bin,Sun, Shuai,Su, Yijin
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supporting information
p. 10877 - 10880
(2017/08/30)
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- Facile synthesis of triarylpyrimidines with microwave-irradiated reactions of N-phenacylpyridinium chloride
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In a system of ammonium acetate and acetic acid under microwave irradiation, N-phenacylpyridinium chloride 1 reacted with 2 mol of aromatic aldehydes 2a-h to give 2,4,6-triarylpyrimidine 3a-h, reacted with pyridinecarboxaldehyde 4a-c and acetophenone 5 to yield bipyridine derivatives 6a-c. The structure of the products was characterized with 1H NMR, 13C NMR, IR, and mass spectroscopy. Copyright Taylor & Francis Group, LLC.
- Wu, Ping,Cai, Xi-Mei,Wang, Qi-Fang,Yan, Chao-Guo
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p. 223 - 229
(2007/10/03)
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- Syntheses of 1-alkyl-2-(substituted-2-pyridyl)benzimidazoles
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1-α-Pyridinium acetophenone chloride 2 on reaction with 2-cinnamoylbenzimidazoles 3 followed by alkylation yields1-alkyl-2-(substituted-2-pyridyl) benzimidazoles 5. The latter could also be synthesized by direct reaction of 2 with 1-alkyl-2-cinnamoylbenzimidazoles 6 in accordance with the Kroehnke's pyridine synthesis.
- Dubey,Kumar, C. Ravi,Reddy, P. V. V. Prasada
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p. 2115 - 2118
(2007/10/03)
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- The Mechanism of Alkylation Reactions. Part 2. The Effect of Pressure and Substituents on the Reaction of Phenacyl Bromide with Pyridine in Methanol
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Rate constants have been determined for the reaction of p-bromophenacyl bromide with pyridine and three substituents pyridines in methanol at 313.2 K.The reaction of phenacyl bromide in methanol at 313.2 K was investigated for pressures up to 100 MPa and the effect of substituents on the volume of activation, ΔV*, determined.From the partial molar volumes of reactants and products, the values of ΔV* were interpreted in terms of the intrinsic volume of the transition state, solvent electrostriction in the transition state and differences in hydrogen bonding between the initial and the transition state.The results support a transition state in which (a) bond forming leads over bond breaking and (b) considerable charge dispersal occurs.A priori calculations of ΔV and ΔV* are compared with experimental values and their utility discussed.
- Forster, William,Laird, Robert M.
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p. 1033 - 1044
(2007/10/02)
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- Ba(OH)2 AS CATALYST IN ORGANIC REACTIONS - PART XIX - STRUCTURE-CATALYTIC ACTIVITY RELATIONSHIP IN THE AdN OF SEVERAL YLIDS TO CH=O GROUP, CATALYZED BY ACTIVATED BARIUM HYDROXIDE CATALYST
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The reactivity of several products R1R2CH-X(1+), 1, (X=N,P,S), which can produce ylids by reaction with bases, has been tested using the activated barium hydroxide catalysts, C-200.Wittig-Horner, Wittig, Corey-Chaykovsky and Kroehnke type reactions have been analyzed.The pKa of 1, and the structure of active sites control the process.When 1 has a strong acid character, the process takes place - dissolving the solid - in homogeneous phase.When 1, has pKa values 11.7), that control the reaction mechanism and the reactivity of adsorbed ylids.
- Sinisterra, J. V.,Marinas, J. M.,Riquelme, F.,Arias, M. S.
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p. 1431 - 1440
(2007/10/02)
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