نتایج جستجو برای: Acetylenic Esters

تعداد نتایج: 28977  

2001
Philippe G. Nantermet Wesley Trotter Isabelle M. Vallin

The copper-catalyzed conjugate addition-cycloacylation reaction of zinc homoenolatee with acetylenic esters or acetylenic amides is described. The zinc homoenolate is prepared from [ (ethoxycyclopropy1)oxyltrimethylsilane and zinc chloride in ether. Addition of an acetylenic amide or ester provides 2-carboxamidoor 2-carboalkoxy-3-alkylcyclopent-2-en-l-ones ingood to excellent yields. The reacti...

Journal: :physical chemistry and electrochemistry 0
mohammad mehdi ghanbari ayoung researchers and elite club, marvdasht branch, islamic azad university, marvdasht, iran abolghasem shameli department of chemistry, omidyeh branch, islamic azad university, omidyeh, iran sina matavos aramyan department of chemistry, marvdasht branch, islamic azad university, marvdasht, iran

the adducts produced in the reaction between trialkyl phosphites and acetylenic esters were trapped by hydantoins to produce highly functionalized dialkyl 2-(2,5-dioxo-4,4-diphenylimidazolidin-1-yl) succinate in good yields.

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2008
malek taher maghsoodlou faramarz rostami charati sayed mostafa habibi khorassani maryam khosroshahrodi

reaction of dialkyl acetylenedicarboxylates 1a-c andpyrrole derivatives 2a-e in the presence of triphenylphosphite (tpp) was investigated and the effect of the pyrrole substitution was established. diastereoselectivity is observed with pyrroles, 2a,b, yieldingphosphonate ester derivatives 3a-f and 4,and their relative configuration is determined by 1h/13c and 31p nmr and confirmed by single x-r...

The adducts produced in the reaction between trialkyl phosphites and acetylenic esters were trapped by hydantoins to produce highly functionalized dialkyl 2-(2,5-dioxo-4,4-diphenylimidazolidin-1-yl) succinate in good yields.

Journal: :Journal of lipid research 1969
D S Sgoutas H Sanders E M Yang

Methyl esters of polyunsaturated fatty acids labeled with tritium were prepared by partial stereoselective reduction of the corresponding acetylenic esters with tritiated disiamylborane, followed by protonolysis with tritiated acetic acid. The labeling was strictly specific, and the tritium atoms were located only at the carbon atoms forming the unsaturated bond(s). Synthesis of some tritiated ...

Journal: :international journal of nano dimension 0
m. qandalee department of biology, garmsar branch, islamic azad university, garmsar, iran. m. hatami polymer research laboratory, university of bonab, bonab, i. r. iran. a. esmaeilzadeh department of chemistry, ayatollah amoli branch, islamic azad university, amol, iran. a. shojaeian department of chemistry, ayatollah amoli branch, islamic azad university, amol, iran. p. biparva department of basic sciences, sari agricultural sciences and natural resources university, p.o. box 578, sari 4818168984, iran.

two-component reaction of 2-aminobenzophenones with acetylenic esters in the presence of γ-al2o3 and cu/zno as suitable heterogeneous catalysts has been studied. nano γ-al2o3 and cu/zno showed high activities when used as surface catalysts for the synthesis of quinoline derivatives. after completion of the reaction, the catalyst was recovered and reused several times under the same reaction con...

A. Esmaeilzadeh A. Shojaeian M. Hatami M. Qandalee, P. Biparva

Two-component reaction of 2-aminobenzophenones with acetylenic esters in the presence of γ-Al2O3 and Cu/ZnO as suitable heterogeneous catalysts has been studied. Nano γ-Al2O3 and Cu/ZnO showed high activities when used as surface catalysts for the synthesis of quinoline derivatives. After completion of the reaction, the catalyst was ...

Journal: :international journal of nano dimension 0
a. ramazani department of chemistry, university of zanjan, p o box 45195-313, zanjan, iran a. farshadi department of chemistry, islamshahr branch, islamic azad university, tehran, iran a. mahyari young researchers club, islamshahr branch, islamic azad university, islamshahr, iran f. sadri department of chemistry, payame noor university, p o box19395-4697 tehran, iran s. w. joo school ofmechanical engineering, yeungnam university, gyeongsan 712-749, republic of korea p. azimzadeh asiabi nuclear science and technology research institute, p.o box 11365-3486, tehran, iran s. taghavi fardood

protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by nh-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a michael addition reaction with a conjugate base to produce phosphorus ylides. silica nanoparticles (silica nps were prepared by therm...

Journal: :Organic & biomolecular chemistry 2009
Li Lin Qiangyang Zhao A-Ni Li Fengbo Ren Fanzhi Yang Rui Wang

The enantioselective synthesis of Anomala osakana pheromone and Janus integer pheromone has been achieved without using any protecting groups. The synthesis involved using an asymmetric alkynylation to obtain gamma-hydroxy-alpha,beta-acetylenic esters with high ee (84%) and yields ( approximately 80%), followed by selective hydrogenation and lactonization in high overall yields (87% and 89%).

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