Three tetra-arylcyclopenta[b]pyrans have been prepared. Halogenation, nitration, formylation, azo-coupling, and Friedel–Crafts alkylation of 2,4,5,6-tetraphenylcyclopenta[b]pyran takes place on C-7. Protonation and condensation with aromatic aldehydes gives pyrylium salts, the structures of which are discussed.
G. V. Boyd and F. W. Clark, J. Chem. Soc. C, 1966, 859 DOI: 10.1039/J39660000859
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