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Perethynylated dehydroannulenes are accessible by oxidative Hay coupling of a tetraethynylethene with a free cis-enediyne unit. Besides a yellow derivative with a planar, aromatic 18π-electron perimeter, compound 1 was isolated. This interesting molecule has a strained, planar antiaromatic 12-membered ring; dilute solutions of 1 are violet and resemble solutions of C60.
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Anthony et al. (1993) studied this question.
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