The action of dichloromethyl methyl ether and tin(IV) chloride on a variety of diaryl sulphides and diaryl ethers (designed so that electrophilic substitution occurs ortho to the bridge atom) gives the corresponding pyrylium and thiopyrylium salts, often in high yield.
J. Ashby, M. Ayad and O. Meth-Cohn, J. Chem. Soc., Perkin Trans. 1, 1973, 1104 DOI: 10.1039/P19730001104
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