Thiolate-containing ligands, aqueous reactions

By using thiolate ligands containing an amino group, recoverable dirhodium ji-thiolato complexes have been obtained [14] (cf. Section 3.2.3). Addition of dilute aqueous sulfuric acid to the hydroformylation reaction mixture causes the immediate and complete precipitation of the yellow ammonium sulphate salt. This solid is insoluble in water and common organic solvents, but can be easily regenerated - by addition of an aqueous base and extraction with an organic solvent - and reused without loss of activity. 

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