2,6-Azulenedicarboxylate

While electronic structure calculations employing DFT are extremely useful they do not allow one to make firm predictions of the properties of the mixed-valence ions formed upon one-electron oxidation. For example, with a 2,6-azulenedicarboxylate bridge the polarity of the bridge resulting from the resonance structure shown in XII naturally leads to a splitting of the two M28 orbitals [23]. However, it rests with experimental data to determine whether the singly... 

A particularly interesting example of electron delocalization is seen for the 2,6-azulenedicarboxylate bridge, previously shown in XII. The W4-containing cation, [(r-BuC02)3W2]2(p--bridge)has a central resonance, g 1.81, and is flanked by... 

Azulene synthesis.10 The reaction between 6-(2-dimethylaminovinyl)fulvene (l)11 and dimethyl acetylenedicarboxylate (2) affords dimethyl 4,5-azulenedicarboxylate (3, 11 %) and dimethyl dimethylaminomaleate (4, ca 20%). 

---