Hexafluorobenzene reacts with sodium methoxide to give pentafluoroanisole which when heated with aluminium chloride yields pentafluorophenol. This strongly acidic phenol has been fully characterised and shown to resist nucleophilic attack. Its hydrazinium salt is formed when pentafluoroanisole reacts with hydrazine hydrate.

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Colchicine a i d Related Compounds. Part X W . * Structure of pand y-lumicolchicine.By E. J. FORBES.[Reprint Order No. 6528.1The action of sunlight on dilute aqueous solutions of colchicine leads to the formation of a-, p-, and y-lumicolchicine, each isomeric with colchicine (Grewe and Wulf, Chem. Bey., 1951, 84, 621). Degradative and spectroscopic evidence suggests that @and 7-lumicolchicine are stereoisomers and indicates that they have tetracyclic structures which arise from a rearrangement of the bonds in the tropolone ring of colchicine.

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