Hitherto it has not been possible to synthesize pentalene or its simple derivatives[¹]. Like fulvene, pentalene should be stabilized by electron donors in the 1- or 3-position [²]. Synthesis of the thermally stable 1,3-bis(dimethylamino)- pentalene (7) has now confirmed this hypothesis.
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Häfner et al. (1967) studied this question.
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