Reactions of Carbon Electrophiles with Cobalt-Coordinated Enynes: Scope and Limitations
作者:Herbert Mayr、Oliver Kuhn、Clemens Schlierf、Armin R Ofial
DOI:10.1016/s0040-4020(00)00347-1
日期:2000.6
increases the nucleophilic reactivity of enynes by a factor of > 106. The exchange of one CO ligand by PPh3 (2a→2d), however, has only little effect on the reactivity of the enyne moiety. The second-order rate constants match the linearfreeenergyrelationship lg k20°C=s(E+N) and allow to determine the nucleophilicity parameters N and s for 2a–d. It is shown that at −70°C, electrophiles with E>0 are able to