Dithiadiazuliporphyrin is a nonaromatic porphyrinoid, readily and reversibly oxidizable to its cation radical and to the unprecedented aromatic carbaporphyrinoid dication, which can be viewed as a 21,23-dicarba-22,24-dithiaporphyrin with two fused tropylium rings.
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Sprutta et al. (2005) studied this question.
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