Characterization of sites of different thermodynamic affinities on the same metal center via isothermal titration calorimetry
作者:Eric G. Moschetta、Kristina M. Gans、Robert M. Rioux
DOI:10.1016/j.jcat.2013.02.020
日期:2013.6
enthalpy, and the binding stoichiometry all in a single experiment. For systems in which two equivalents of ligand were able to bind to the Pd center, the binding sites on each Pd center in solution showed a different thermodynamic affinity for the same ligand. Changes in binding modes between different phosphorus ligands were due to steric bulk and poor electron-donating ability of such ligands. Our results
Palladium-catalyzed oxyhexatriene cyclization: a novel approach to cyclohexenone annulation
作者:Christina M. Hettrick、William J. Scott
DOI:10.1021/ja00013a028
日期:1991.6
cyclization of [(trimethylsilyl)oxy]hexatrienes (SOHs) to afford cyclohexenones. This novel reaction represents the first general approach to the hexatriene cyclization of dienone enolates or their derivatives. Fully-conjugated dienones are readily converted to the kinetic enolates with LDA and trapped as the silylenolethers. Heating of these compounds in refluxing toluene or xylenes in the presence of 5 mol