Synthesis and Characterization of Gold(III) Adducts and Cyclometallated Derivatives with 2-Substituted Pyridines. Crystal Structure of Cl2>

DOI: 10.1039/DT9950002865

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2865 - 2872 (1995)

Update date:2022-08-03

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Authors:

Cinellu, Maria Agostina

Zucca, Antonio

Stoccoro, Sergio

Minghetti, Giovanni

Manassero, Mario

Sansoni, Mirella

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Article abstract of DOI:10.1039/DT9950002865

The 2-benzylpyridines HL reacted with AuCl3*2H2O or Na to give adducts or cyclometallated derivatives .The metallation reaction involves direct activation of a C-H bond of the phenyl substituent.With the 2-alkylpyridines NC5H4(CMe3)-2 and NC5H4(CH2CMe3)-2 (HL) only the tetrachloroaurate(III) salts were isolated.The structure of Cl2> has been determined by X-ray diffraction.It reveals a six-membered ring having a boat-like conformation: there is a rather short interaction between one hydrogen of the Me group in axial position and the gold atom, Au...H 2.56(5) Angstroem.The cyclometallated species react with PPh3 to give cationic complexes (1+) and with 1,2-bis(diphenylphosphino)ethane (dppe) to yield (1+).Under pressure (50 atm, 60 deg C) of CO extrusion of the metal occurs.The organic products formed likely arise from insertion of CO into the Au-C bond.The reactivity of the cycloaurated species is compared with that of analogous palladium(II) derivatives previously.

Full text of DOI:10.1039/DT9950002865

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