Homogeneous Decatungstate-Catalyzed Photooxygenation of Tetrasubstituted Alkenes: A Deuterium Kinetic Isotope Effect Study
作者:Ioannis N. Lykakis、Georgios C. Vougioukalakis、Michael Orfanopoulos
DOI:10.1021/jo061238u
日期:2006.11.1
The decatungstate W10O324- homogeneous photocatalyzed oxygenation of tetrasubstituted alkenes has been mechanistically studied. In all cases, allylic hydroperoxides are the major products. The primary inter- and intramolecular as well as the remote δ-secondary deuterium kinetic isotope effects for the photooxidation of the 2,3-dimethyl-2-butene and 1,1,1-trideuterio-7-methyl-2-(trideuteriomethyl)octa-2
已对四取代烯烃的去阳离子钨酸盐W 10 O 32 4-均相光催化氧化进行了机理研究。在所有情况下,烯丙基氢过氧化物都是主要产品。分子间和分子内以及远处的δ-次级氘动力学同位素效应对2,3-二甲基-2-丁烯和1,1,1-三叔甲基7-甲基-2-(三叔甲基)的光氧化作用octa-2,6-diene和产物分析表明在速率确定步骤中会析氢。为了比较,还研究了上述底物的单重态氧光敏氧化。
Solvent-Dependent Changes in the Triazolinedione-Alkene Ene Reaction Mechanism
作者:Georgios C. Vougioukalakis、Manolis M. Roubelakis、Mariza N. Alberti、Michael Orfanopoulos
DOI:10.1002/chem.200800920
日期:2008.10.29
The influence of the solvent on the triazolinedione-alkene enereactionmechanism has been investigated. Both inter- and intramolecularkineticisotopeeffects with tetramethylethylenes and 2,2,2-(trideuterio)methyl-7-methyl-2,6-octadiene-[D3]-1,1,1 provide, for the first time, strong evidence for changes in the mechanism of the reaction on going from non-protic to polar protic solvents. In non-protic
Solid-phase synthesis for novel nerve agent adducted nonapeptides as biomarkers
作者:Xinhai Li、Ling Yuan、Qinggang Wang、Longhui Liang、Guilan Huang、Xiaosen Li、Chunhong Zhang、Shilei Liu、Jingquan Liu
DOI:10.1016/j.tetlet.2017.02.017
日期:2017.4
An efficient synthesis of d5-VX adducted nonapeptide and d15-GD adducted nonapeptide via solid-phase approach has been developed. The deuterated peptides could be used as the isotope-labeled internal standard for LC-MS/MS detecting the BuChE-OPNA biomarkers. This method also offers an access to the synthesis and detection of other phosphorylated nonapeptides.
Mechanism of the Mild Functionalization of Arenes by Diboron Reagents Catalyzed by Iridium Complexes. Intermediacy and Chemistry of Bipyridine-Ligated Iridium Trisboryl Complexes
作者:Timothy M. Boller、Jaclyn M. Murphy、Marko Hapke、Tatsuo Ishiyama、Norio Miyaura、John F. Hartwig
DOI:10.1021/ja053433g
日期:2005.10.1
electron-poor arenes than with electron-rich arenes. However, both the stoichiometric and catalytic reactions also occur faster with the electron-rich heteroarenes thiophene and furan than with arenes, perhaps because eta(2)-heteroarene complexes are more stable than the eta(2)-arene complexes and the eta(2)-heteroarene or arene complexes are intermediates that precede oxidativeaddition. Kinetic studies on the
Deuterated forms of N-3-[5-(2-Amino-4-pyrimidinyl)-2-(1,1-dimethylethyl)-1,3-thiazol-4-yl]-2-fluorophenyl}-2,6-difluorobenzenesulfonamide and pharmaceutical compositions containing the same.