Palladium(0)-Alkene Bis(triarylphosphine) Complexes as Catalyst Precursors for the Methoxycarbonylation of Styrene

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• 作者：Jeroen J. M. de Pater ; D. S. Tromp ; Duncan M. Tooke ; Anthony L. Spek ; Berth-Jan Deelman ; Gerard van Koten ; and Cornelis J. Elsevier
• 刊名：Organometallics
• 出版年：2005
• 出版时间：December 19, 2005
• 年：2005
• 卷：24
• 期：26
• 页码：6411 - 6419
• 全文大小：165K
• 年卷期：v.24,no.26(December 19, 2005)
• ISSN：1520-6041

文摘

The fluorous complex [Pd(0)(P{C₆H₄-p-SiMe₂(CH₂CH₂C₆F₁₃)}₃)₂(MA)] (MA = maleicanhydride) was synthesized and characterized by its NMR spectra. Together with thenonfluorous complexes [Pd(0)(PPh₃)₂(alkene)] (alkene = C₂H₄, (NC)₂C=C(CN)₂, NCC(H)=C(H)CN, MA, or benzoquinone) these were evaluated as catalyst precursors in themethoxycarbonylation of styrene. The nonfluorous C₂H₄ and MA complexes gave the highestconversions (the turnover number (TON) was 120; the (average) turnover frequency (TOF)amounted to 80 h^-1). The fluorous complex gave a significantly lower conversion (TON about38; TOF 26 h^-1) than its nonfluorous counterpart, which is caused by a lower stability ofthe fluorous complex under the reaction conditions.