Iminophosphine-palladium(0) complexes as catalysts in the alkoxycarbonylation of terminal alkynes

✍ Scribed by A Scrivanti; U Matteoli; V Beghetto; S Antonaroli; R Scarpelli; B Crociani

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 91 KB
• Volume: 170
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(01)00069-3

✦ Synopsis

In the presence of methanesulfonic acid, the palladium(0)-olefin complexes: [Pd( 2 -ol)(P-N)] [ol = dimethyl fumarate or fumaronitrile, P-N = 1-(Ph 2 P)C 6 H 4 -2-CH=NR (R = CMe 3 or C 6 H 4 OMe-4)] catalyse the alkoxycarbonylation of terminal alkynes. Moderately good rates are obtained when the catalysts are promoted with two equivalents of the free P-N ligand and a large excess of acid at 120 • C. The catalytic data suggest that derivatives of the type [Pd(alkyne)(P-N) n ] (n = 2-3) are the active catalytic species.