224962-87-2Relevant academic research and scientific papers
Reductive elimination of the alkenyl fragment and a phosphine ligand from [Rh(acac){(E)-CH=CHR}(PCy3)2]BF4 (R=Cy, Ph, H): Preparation of [(E)-RHC=CHPCy3]BF4 from alkynes
A. Esteruelas, Miguel,Lahoz, Fernando J.,Martin, Marta,Martinez, Ana,Oro, Luis A.,Puerta, M. Carmen,Valerga, Pedro
, p. 265 - 270 (1999)
In dichloromethane under reflux, the five-coordinate alkenyl complexes [Rh(acac){(E)-CH=CHR}(PCy3)2]BF4 [R=Cy (1), Ph (2), H (3)] evolve into the alkenylphosphonium derivatives [Rh(acac){η2-(E)-CH(PCy3)=CHR}(PCy 3)]BF4 [R=Cy (4), Ph (5), H(6)], by reductive elimination reactions involving the one-electron alkenyl fragments and one of the two-electron phosphine ligands of 1-3. Complexes 4-6 react with carbon monoxide to afford Rh(acac)(CO)(PCy3) and [(E)-RHC=CHPCy3]BF4 [R=Cy (8), Ph (9), H (10)]. In addition, we describe a new route for the preparation of alkenylphophonium salts starting from terminal alkynes, PCy3 and HBF4, and using the Rh(acac)(PCy3) unit as a template.
