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Ultraviolet spectrophotometry has been used for the identification and characterization of tobacco alkaloids and related substances, but the ultraviolet spectra cannot be used to distinguish among alkaloids having equivalent degrees of conjugated unsaturation.

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Using toluene and acetyl chloride as the organic reactants, Dermer and his collaborators (1) recently studied the relative effectiveness of several metallic chlorides in the Friedel-Crafts synthesis (2) of p-methylacetophenone. As these workers (1) reported that tellurium dichloride and tetrachloride had been observed for the first time to function as Friedel-Crafts catalysts, it appears desirable to record some preliminary experiments of a similar nature that were made several years ago. The results of these earlier experiments were not published because the investigation, although temporarily abandoned, was incomplete.