Synthesis, Structure and Reactivity of [(acac)AuCH(PPh2AuPPh2)2CHAu(acac)], a Complex Containing the Tridentate Ligand [HC(PPh2)2]−

✍ Scribed by Fernández, Eduardo J. ;Concepci Gimeno, M. ÁN ;Jones, Peter G. ;Laguna, Antonio ;Laguna, Mariano ;Lápez-de-Luzuriaga, José M. ;Rodríuez, Miguel A.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1995
• Tongue: English
• Weight: 481 KB
• Volume: 128
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.19951280206

✦ Synopsis

The complex [ (acac)AuCH(PPhzAuPPh2)zCHAu( )] (1) is obtained by various procedures: a) by reaction of [Ph3PAuCH ( PPhzAuPPhz)zCHAuPPh3] ( C104)2 with NBu4 [Au( acac)Cl], b) by reaction of [CIAuCH(PPhzAuPPhz)zCHAuC1] with [Au(acac)PPh,] or with Tl(acac) and c) by reaction of [CIAuPPhzCHzPPhzAuC1] with Tl(acac). The acetylacetonato ligand can act as deprotonating agent; thus, complex 1 reacts with (phosphane)gold complexes, [Au(C6F5)2[(PPh& CH,]] C104, [ Au( C6F5)3 ( PPhzCHzPPhz)] or [ Au(PPh3),] C104, (Acety1acetonato)gold complexes, such as [Au(acac)-PPhJ, [N(PPh3)2][Au(acac)Cl] or [N(PPh3)2][Au(acac)2],

have been used for the synthesis of ylide"] and methanideL2] complexes of gold. They are excellent precursors for abstracting one or two protons from CH or CH2 groups, thus leaving one or two free coordination sites. The acac ligand is displaced as acetylacetone.

Here, we have studied the preparation of the tetranuclear compound [(a~ac)AuCH(PPh~AuPPh~)~CHAu(acac)] (1) and its reactivity as a deprotonating agent of (diphosphane)gold derivatives. The structure of 1 has been established by single-crystal X-ray analysis.