Abstract
Photolysis of tricarbonyl(1,4-diaza-1,3-diene)iron complexes in the presence of dienes (butadiene, 2,3-dimethylbutadiene, cyclohexadiene-1,3) yields the title compounds, liberating 2 moles of CO. Imines or Schiff bases of 1,2-dicarbonyl compounds and of 2-acylpyridines are suitable 1,4-diazadiene ligands, DAD, in the starting tricarbonyl complexes. The photoreaction consists of two consecutive steps, the first of which is thermally reversible. According to the spectral data (IR, 1H NMR and UV-vis) the compounds have a square pyramidal geometry around the central iron atom with basal/basal coordination of DAD and diene. This contrasts the N, N′ apical/basal coordination of the DAD ligands in the previously described compounds with diethyl muconate as the diene ligand.
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