The catalyst precursor consisting of a mixt. of 10% palladium on carbon and 3.9 equiv. of AsPh3 as well as that obtained by treatment of Pd(OAc)2 with 4 equiv of AsPh3 in THF at 60° for 1 h have proven to be suitable for promoting efficient cross-coupling reaction between aryl- or 1-alkynylzinc chlorides and alkenyl halides which contain an electron-withdrawing substituent linked to their carbon-carbon double bond. The activity of these catalyst precursors has been found to be comparable to that of the more expensive and air unstable Pd(PPh3)4.
New catalyst precursors constituted of AsPh3 and palladium on carbon or palladium(III) acetate as efficient promoters of selective cross-coupling reactions between functionalized alkenyl halides and aryl- or 1-alkynylzinc chlorides
ROSSI, RENZO;BELLINA, FABIO;CARPITA, ADRIANO;
1995-01-01
Abstract
The catalyst precursor consisting of a mixt. of 10% palladium on carbon and 3.9 equiv. of AsPh3 as well as that obtained by treatment of Pd(OAc)2 with 4 equiv of AsPh3 in THF at 60° for 1 h have proven to be suitable for promoting efficient cross-coupling reaction between aryl- or 1-alkynylzinc chlorides and alkenyl halides which contain an electron-withdrawing substituent linked to their carbon-carbon double bond. The activity of these catalyst precursors has been found to be comparable to that of the more expensive and air unstable Pd(PPh3)4.File in questo prodotto:
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