A facile enrichment in 13CO of tetrairidium carbonyl cluster compounds promoted by trimethylamine oxide
作者:Renzo Ros、Augusto Tassan
DOI:10.1016/s0020-1693(96)05540-5
日期:1997.7
The reactions of anionic clusters [Ir(4)1(CO)(11)X](-) (X=Br, I), with excess of (CO)-C-13 gave enriched Ir-4(*CO)(12); the level of (CO)-C-13 enrichment was 9.2%, corresponding to stoichiometric replacement of the labile ligand X-. From the enriched Ir-4(*CO)(12) the equi-enriched derivatives [Ir-4(*CO)(11)X](-) can be prepared, on which the exchange of X- with (CO)-C-13 can be carried out again. This (CO)-C-12-(X-)-(CO)-C-13 exchange cycle can be repeated until required. An alternative process for more profitable and general enrichment of Ir-4(CO)(12) derivatives involves replacement of coordinated (CO)-C-12 by free (CO)-C-13 promoted by Me3NO, which acts as an oxidative decarbonylating reagent.