Reactions demonstrated alkyne cycloisomerization to produce dinaphtho derivatives, indicating catalyst efficiency.
Reactions of the title compounds with PtCl2 catalyst produced dinaphthoanthracene derivatives via 6-endo cyclization of the two alkyne moieties. For the reactions of a phenylethynyl substituted precursor, migration of one of the phenyl groups was observed on cyclization with PtCl2 catalyst and additional cyclization was observed on cyclization with TfOH. The structures and spectroscopic properties of these polycyclic aromatic hydrocarbons are reported.
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Morita et al. (2025) studied this question.
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