Carbon-Carbon Double Bond Formation from Two o-Methyl Groups in Osmium Phosphine Complexes

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• 作者：Walter Baratta ; Eberhardt Herdtweck ; Paolo Martinuzzi ; and Pierluigi Rigo
• 刊名：Organometallics
• 出版年：2001
• 出版时间：January 22, 2001
• 年：2001
• 卷：20
• 期：2
• 页码：305 - 308
• 全文大小：66K
• 年卷期：v.20,no.2(January 22, 2001)
• ISSN：1520-6041

文摘

The osmium complex [(NH₄)₂OsCl₆] reacts with PPh₂(2,6-Me₂C₆H₃) in a 2-propanol-watermixture at reflux to give quantitatively a cyclometalated osmium(II) complex containing atridentate trans-stilbene-type ligand, which forms via a dehydrogenative carbon-carbon coupling of two phosphine o-methyl groups. The structure of this complex has been determinedby an X-ray investigation. Carbon-carbon double bond formation has also been observed inthe reaction of the osmium(II) precursor [OsCl₂(PPh₃)₃] with PPh₂(2,6-Me₂C₆H₃) in toluene,leading to a hydrido osmium(II) complex containing the same tridentate stilbene-type ligand.