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Synthesis of the pentacarbonyl(chalcocarbonyl)chromium(0) complexes, Cr(CO)5(CX) (X = S, Se)

1981; Elsevier BV; Volume: 205; Issue: 2 Linguagem: Inglês

10.1016/s0022-328x(00)81474-6

1872-8561

Ann M. English, Keith R. Plowman, Ione Maluf Baibich, James P. Hickey, Ian S. Butler, Gérard Jaouen, Paul Lemaux,

Asymmetric Hydrogenation and Catalysis

The arene complexes, (η6-C6H6)Cr(CO)2(CX) (X = S, Se), react with excess CO gas under pressure in tetrahydrofuran at about 60° C to produce the Cr(CO)5(CX) complexes in high yield. The IR and NMR (13C and 17O) spectra of these complexes are in complete accord with the expected C4v molecular symmetry. Like the analogous W(CO)5(CS) complex, both compounds react with cyclohexylamine to give Cr(CO)5(CNC6H11). However, while W(CO)5(CS) undergoes stereospecific CO substitution with halide ions (Y− to form trans-[W(CO)4(CS)Y]−, the two chromium chalcocarbonyl complexes apparently undergo both CO and CX substitution to afford mixtures of [Cr(CO)5Y]− and trans-[Cr(CO)4(CX)Y]−.