Rhodium-catalyzed synthesis of 2,3-diaryl-1,4-diketones via oxidative coupling of benzyl ketones using α-thioketone oxidizing reagent
作者:Mieko Arisawa、Guangzhe Li、Masahiko Yamaguchi
DOI:10.1016/j.tetlet.2012.12.107
日期:2013.3
no)benzene (dppBz) catalyzed the oxidativecoupling reaction of aryl benzyl ketones giving 2,3-diaryl-1,4-diketones in high yields. 3,3-Dimethyl-1-methylthio-2-butanone was used as the oxidizing reagent, which was converted to 3,3-dimethyl-2-butanone and dimethyl disulfide. Rhodium enolates were catalytically formed from ketones, which underwent oxidativecoupling using an organosulfur reagent.
Modulation of Lifetimes and Diastereomeric Discrimination in Triplet-Excited Substituted Butane-1,4-diones through Intramolecular Charge-Transfer Quenching
作者:J. N. Moorthy、S. L. Monahan、R. B. Sunoj、J. Chandrasekhar、C. Bohne
DOI:10.1021/ja9818708
日期:1999.4.1
lifetimes have been determined for the diastereomers of a broad set of butane-1,4-dione derivatives (1−3). A remarkable dependence of lifetimes on conformationalpreferences is revealed in that the lifetimes are shorter for the meso diastereomers of 1−3 than those for the racemic ones. The intramolecular β-phenyl quenching is promoted in the case of meso diastereomers by virtue of the gauche relationship