1066880-29-2Relevant academic research and scientific papers
An exploratory study of regiocontrol iii the heck type reaction. Influence of solvent polarity and bisphosphine ligands
Ludwig, Maik
, p. 970 - 975 (1999)
The regiochemistry of the addition of arylpalladium species to styrene and propene has been studied. It was found that for the reaction of P2Pd(Ph)X the counterion X, the polarity of the solvent, and the structure of the bisphosphine ligand ?2 all have an influence. Using bis(diphenylphosphino)ethane as ligand, triflate as counterion, and a moderately polar solvent mixture, 98% selectivity for addition of the phenyl group to the /?-carbon of styrene could be obtained. Finally, using low-temperature NMR, some of the palladium intermediates in the addition could be observed, specifically those where the palladium species is stabilized by ?/3-allylic interaction with a phenyl group.
