Issue 16, 1974

Carbene complexes. Part VIII. Chromium(0), iron(0), rhodium(I), iridium(I), nickel(II), palladium(II), platinum(II), and gold(I) mono- and oligo-carbene species from electron-rich olefins

Abstract

The reaction of the electron-rich olefin 1,1′,3,3′-tetramethyl-2,2′-bi-imidazolidinylidene (I)([triple bond, length as m-dash]L2) or, in one case, of bis(N-methylbenzothiazolinylidene)(II)([triple bond, length as m-dash]L′2) with various transition metal d6 or d8 complexes yields mono- di-, or tri-carbene metal complexes of Cr0, Fe0, RhI, IrI, NiII, PdII, PtII, or AuI, such as cis-Cr(CO)4(L)2, [Ir(CO)(L)3]+, or cis-[PtMe(PPh3)(L)2]+. The reactions involve (i) displacement from the metal of a negative (Cl, I) or neutral [CO, tertiary phosphine, or π-allyl (transformed into σ-allyl)] ligand or ligands by one or more nucleophilic carbene moieties L or L′, (ii), for [Rh(CO)2Cl]2, bridge-splitting by L, or (iii) displacement of a halide anion by BF4. The twenty-four new carbene complexes are stable and their ready formation in high yield serves as a further demonstration of the scope of electron-rich olefins as reagents in transition metal chemistry. They clearly behave as nucleophilic carbene (L or L′) transfer reagents.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1974, 1827-1833

Carbene complexes. Part VIII. Chromium(0), iron(0), rhodium(I), iridium(I), nickel(II), palladium(II), platinum(II), and gold(I) mono- and oligo-carbene species from electron-rich olefins

B. Cetinkaya, P. Dixneuf and M. F. Lappert, J. Chem. Soc., Dalton Trans., 1974, 1827 DOI: 10.1039/DT9740001827

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