Butadienesulfonyl iridium complexes with phosphine and carbonyl ligands

Publication date: Available online 13 September 2019Source: Journal of Organometallic ChemistryAuthor(s): Karla Sánchez-Sánchez, Antonio A. Castillo García, Marisol Cervantes-Vásquez, Naytzé Ortiz-Pastrana, M. Angeles Paz-SandovalAbstractThe metathesis reaction of IrCl(CO)(PPh3)2 (4) and Vaska-type derivatives IrCl(CO)(PR3)2 (PR3 = MePh2, 5; Me2Ph, 6; Me3, 7) with 1–2 equivalents of the potassium butadienesulfinate salts K(SO2CHCRCHCH2) (R = H, 2; Me, 3) led to the formation of mixtures of chiral diastereomers “a” and “b” of general formula Ir(1–2,5-η-CH2CHCRCHSO2)(CO)(L)2 (R = H, L = PPh3, 8a,b; PMePh2, 9a,b; PMe2Ph, 10a,b; PMe3, 11a,b; R = Me, L = PPh3, 12a,b; PMePh2, 13a,b; PMe2Ph, 14a,b; PMe3, 15a,b) In isomer “a” both phosphine ligands L are located at the open mouth of the butadienesulfonyl ligand, and between the non-coordinated double bond of the same non-planar ligand, respectively; while the CO is opposite to the SO2 group. In isomer “b”, one phosphine remains in the open mouth of the butadienesulfonyl ligand, and the CO and the second phosphine have exchanged positions, being now the CO near to the SO2 group, and the phosphine opposite to the SO2 group. The most abundant isomer is assignable to a for 9a-11a and 12a-15a, while the opposite is observed in 8a and 12a with the bulkier triphenylphosphine. Electronic and predominant steric factors have been implicated as being most responsible for leading to a preference ...

Source: Journal of Organometallic Chemistry - September 14, 2019 Category: Chemistry Source Type: research