CLII.—The synthesis of derivatives of thioxanthone from aromatic disulphides

Organic Chemistry of α-Methylstyrene. I. Reactions Leading to N-(α,α-Dimethyl-substituted-benzyl)acrylamides

“…Reaction of either 2,2 '-dithiodibenzoic acid or omercaptobenzoic acid with bromobenzene in concentrated sulfuric acid gave a compound (I) with a melting point, 166-167°, tvhich does not agree with that, 141°, reported for rr-bromo-10-thiaxanthenone prepared initially by Smiles in an analogous manner. 3 The bromine atom ivas shown to be in the 2-position by the following sequence of reactions. A Sandmeyer reaction on 2-amino-10-thia-xanthenone4 gave 2-bromo-10-thiaxanthenone (II) which showed no depression in melting point when admixed with the above z-bromo-10-thiaxanthenone (I).…”