cas 21037-34-3, (R,R)-(-)-2,3-DIPHENYLSUCCINIC ACID

Articles about 21037-34-3Total 9 be found

Efficient electrochemical dicarboxylation of phenyl-substituted alkenes: Synthesis of 1-phenylalkane-1,2-dicarboxylic acids
Electrochemical dicarboxylation of phenyl-substituted alkenes in the presence of atmospheric pressure of carbon dioxide with a platinum plate cathode and a magnesium rod anode readily took place efficiently in a DMF solution containing 0.1 M Et4NClO4 to give the corresponding 1,2-dicarboxylic acids in high yields.
Senboku,Komatsu,Fujimura,Tokuda
p. 418 - 420
(2007/10/03)

Convenient synthetic methods to C2 symmetric 3,4-diphenylpyrrolidines
Convenient methods of synthesis of racemic and optically pure 3,4- diphenylpyrrolidine derivatives, involving oxidative coupling of ethyl phenylacetate using TiCl4/Et3N and reduction of the dl-2,3-diphenylsuccinic acid or the corresponding cyclic imide with NaBH4/I2 reagent in crucial steps, are described.
Rao, Vutukuri Dharma,Periasamy, Mariappan
p. 703 - 706
(2007/10/03)

Dependence of the reactivities of titanium enolates on how they are generated: Diastereoselective coupling of phenylacetic acid esters using titanium tetrachloride
Oxidative coupling of phenylacetic acid esters was easily achieved by treating the esters with TiCl4 and then adding Et3N to the resulting solution. The products consisted of dl- and meso-2,3-diphenylsuccinic acid esters with the Claisen condensation product, and the ratio of these products depended on the reaction conditions. Reaction conditions suitable for high dl selectivity were determined, and a dimer of titanium enolate was postulated as an intermediate responsible for the high dl selectivity. The selectivities were compared with those in known oxidative couplings in which titanium enolate intermediates are prepared through lithium enolates and silyl enol ethers. The results suggest that the reactivities of titanium enolates intermediates depend on how they are generated.
Matsumura, Yoshihiro,Nishimura, Maiko,Hiu, Hiroyuki,Watanabe, Mitsuaki,Kise, Naoki
p. 2809 - 2812
(2007/10/03)

Enatioselective Synthesis of 2,3-Disubstituted Succinic Acids by Oxidative Homocoupling of Optically Active 3-Acyl-2-oxazolidones
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Kise, Naoki,Tokioka, Kyohei,Aoyama, Yasunori,Matsumura, Yoshihiro
p. 1100 - 1101
(2007/10/02)

Influence of β-arranged substituents in chiral seven-membered rhodium diphosphine rings on asymmetric hydrogenation of amino acid precursors
Investigations concerning the optical induction in asymmetric hydrogenation reactions confirm the stereochemical control function of mono- and di-substituents in seven-membered chelate ring diphosphines, whereby the bulkiness of substituents in the backbone of the ligands is reflected in higher enantioselectivities.
Krause, Hanswalter,Sailer, Cornelia
p. 271 - 279
(2007/10/02)

NEW STEREOSELECTIVE METHOD FOR HYDROCARBON CHAIN CONSTRUCTION. CONVERSION OF N,N'-DIALKYL-N,N'-DIACYLHYDRAZINES TO DERIVATIVES OF THREO-1,2-DICARBOXYLIC ACIDS
N,N'-Dialkyl-N,N'-diacylhydrazines are converted by the action of strong bases into N,N'-dialkylamides of threo-1,2-dicarboxylic acids.
Magedov, I.V.,Smushkevich, Yu. I.
p. 632 - 636
(2007/10/02)

Reaction of Dilithiated Carboxylic Acids with Iodine: Evidence for the Formation of a Radical Anion Intermediate
The mechanism for oxidative dimerization of carboxylic acid dianions involves single electron transfer to iodine, producing an organic anion radical.Rearrangement of this species was observed with suitable substrates at a rate competitive with intermolecular reactions.The radical anion can dimerize or react with iodine.The iodide thus generated can be isolated (reaction with excess of iodine) or can participate in a polar SN2-type reaction sequence leading to dimeric products (reaction with 1/2 equiv of iodine).The interference by free amines (liberated during the metalation with lithium amides) is rationalized by the formation of a charge-transfer complex with iodine which decomposes, liberating protons.
Renaud, Philippe,Fox, Marye Anne
p. 3745 - 3752
(2007/10/02)

Direct Optical Resolution of Carboxylic Acids by Chyral HPLC on Tris(3,5-dimethylphenylcarbamate)s of Cellulose and Amylose
A variety of racemic carboxylic acids have been for the first time directly resolved by normal-phase, high-performance liquid chromatography using a hexane-2-propanol eluting system containing a small amount (ca. 1percent) of a strong carboxylic acid, like formic acid, trichloroacetic acid, and trifluoroacetic acid.
Okamoto, Yoshio,Aburatani, Ryo,Kaida, Yuriko,Hatada, Koichi
p. 1125 - 1128
(2007/10/02)