The impressive synthetic chem. that has developed following the elucidation of the organodiiron units within the [FeFe]-H2ase enzyme active site has largely depended on the availability of an easily accessed precursor, (μ2-S2)[Fe(CO)3]2. In reduced bis sulfide form, (μ2-S)2[Fe(CO)3]2 2-, alkylation and condensation at sulfur gives a well known range of products, advancing in the last decade to the more faithful analogs of the [FeFe]-H2ase eas, (μ2-SCH2
