- DABCO-catalyzed reaction of phenols or 1,2-diphenols with activated alkynes leading to the formation of alkenoic acid esters or 1,3-dioxole derivatives
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The reaction of phenols or 1,2-diphenols with activated alkynes took place smoothly and rapidly in the presence of a catalytic amount of 1,4-diazabicyclo[2.2.2]octane (DABCO) at room temperature and resulted in the formation of various alkenoic acid ester
- Fan, Ming-Jin,Li, Gao-Qiang,Li, Lian-Hua,Yang, Shang-Dong,Liang, Yong-Min
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p. 2286 - 2292
(2008/02/02)
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- Stereoselective conversion of stabilized phosphorus ylides to dialkyl 2-(2-nitro-phenoxy)-2-butenedioates in the presense of silica gel in solvent-free conditions
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Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates, by 2-nitrophenol leads to vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce dialkyl 2-(2-nitro-phenoxy)- 3-(triphenylphosphoranylidene)butanedioates. Silica-gel powder was found to catalyze the stereoselective conversion of dialkyl 2-(2-nitro-phenoxy)-3- (triphenylphosphoranylidene)butanedioates to dialkyl 2-(2-nitro-phenoxy)-2- butenedioates in solvent-free conditions under microwave (0.5 KW, 3 min) and thermal (90°C, 60 min) conditions. Copyright Taylor & Francis Group, LLC.
- Ramazani, Ali,Rahimifard, Mahshid
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p. 2675 - 2678
(2007/10/03)
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- PROCESS FOR PRODUCING CHROMONE COMPOUND
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A process for producing a dicarboxylic acid compound represented by the formula (4): wherein R1 and R2 are the same or different and each represents lower alkyl and the wavy line indicates that this compound is the E- or Z-isomer or
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