The reactivity of ketyl and alkyl radicals in reactions with carbonyl compounds
作者:E. T. Denisov
DOI:10.1007/bf02494263
日期:1998.11
parabolic model of bimolecular radical reactions was used for analysis of the hydrogen transfer reactions of ketyl radicals: >C·OH+R1COR2→>C=O+R1R2C·OH. The parameters describing the reactivity of the reagents were calculated from the experimental data. The parameters that characterize the reactions of ketyl and alkyl radicals as hydrogen donors with olefins and with carbonyl compounds were obtained: >C·OH
Factors Influencing C−ON Bond Homolysis in Alkoxyamines: Unexpected Behavior of SG1 (<i>N</i>-(2-methyl-2-propyl)- <i>N</i>-(1-diethylphosphono-2,2-dimethylpropyl)-<i>N</i>-oxyl)-Based Alkoxyamines
作者:Denis Bertin、Didier Gigmes、Christophe Le Mercier、Sylvain R. A. Marque、Paul Tordo
DOI:10.1021/jo0495586
日期:2004.7.1
Alkoxyamines and persistent nitroxides are important regulators of nitroxide-mediated radical polymerization (NMP). Since the polymerization time decreases with the increasing equilibrium constant K (kd/kc), i.e., the increasing rate constant kd of the homolysis of the C−ON bond between the polymer chain and the nitroxide moiety, the factors influencing the cleavage rate constants are of considerable
Understanding Atom Transfer Radical Polymerization: Effect of Ligand and Initiator Structures on the Equilibrium Constants
作者:Wei Tang、Yungwan Kwak、Wade Braunecker、Nicolay V. Tsarevsky、Michelle L. Coote、Krzysztof Matyjaszewski
DOI:10.1021/ja802290a
日期:2008.8.13
in Cu-based atomtransferradicalpolymerization (ATRP) were determined for a wide range of ligands and initiators in acetonitrile at 22 degrees C. The ATRP equilibrium constants obtained vary over 7 orders of magnitude and strongly depend on the ligand and initiator structures. The activities of the Cu(I)/ligand complexes are highest for tetradentate ligands, lower for tridentate ligands, and lowest
A cobaloxime-mediated radical route to butenolides
作者:Bruce P. Branchaud、Rachel M. Slade、Samantha K. Janisse
DOI:10.1016/s0040-4039(00)61501-0
日期:1993.12
be converted by oxidation and thermal syn elimination into 3-substituted maleic anhydrides, which are known to be regioselectively and chemoselectively reduced to produce γ-hydroxybutenolides or butenolides.