21037-34-3Relevant articles and documents
Efficient electrochemical dicarboxylation of phenyl-substituted alkenes: Synthesis of 1-phenylalkane-1,2-dicarboxylic acids
Senboku,Komatsu,Fujimura,Tokuda
, p. 418 - 420 (2007/10/03)
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.
Dependence of the reactivities of titanium enolates on how they are generated: Diastereoselective coupling of phenylacetic acid esters using titanium tetrachloride
Matsumura, Yoshihiro,Nishimura, Maiko,Hiu, Hiroyuki,Watanabe, Mitsuaki,Kise, Naoki
, p. 2809 - 2812 (2007/10/03)
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.
Influence of β-arranged substituents in chiral seven-membered rhodium diphosphine rings on asymmetric hydrogenation of amino acid precursors
Krause, Hanswalter,Sailer, Cornelia
, p. 271 - 279 (2007/10/02)
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.