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Oxidative Trimerization of Alkynyl Groups at Trimethylphosphane Palladium-Complexes
Klein, Hans-Friedrich,Zettel, Bernd,Floerke, Ulrich,Haupt, Hans-Juergen
, p. 9 - 14 (2007/10/02)
Alkynylpalladium halides trans-PdX (C*CR)(PMe3)2 were synthesized by routine methods, while further examples of the series trans-PdX (C*CR)(PMe3)2 and trans-PdX (C*CR)(PPh3)2 (12 - 14, X = I, R = SiMe3, CMe3, CH2OH) were obtained by oxidative addition of 1-halogeno-1-alkynes to PdL4 (L = PMe3, PPh3).Just above the melting point or decomposition point 5 - 7 are transformed by oxidative trimerization ofthe alkynyl groups to give enediynyl complexes trans-PdX(PMe3)2 (15, 16, R = SiMe3, X = Br, I; 17, X = Br, R = CMe3).According to an X-ray structure analysis 17 has E configuration. Key Words: Alkynyl groups / Palladium, trimethylphosphane complexes / Trimerization, oxidative
