The action of dichloromethyl alkyl ethers and tin(IV) chloride on a variety of diarylmethanes (constructed such that electrophilic substitution occurs ortho to the methylene bridge) is shown to be an efficient means for the synthesis of polycyclic aromatic and heteroaromatic systems which are otherwise difficult to obtain.
M. Ahmed, J. Ashby, M. Ayad and O. Meth-Cohn, J. Chem. Soc., Perkin Trans. 1, 1973, 1099 DOI: 10.1039/P19730001099
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