I. The P'reuss and Binz reaction, i.e. the conversion of o- nitrotoluene to anthranilic acid by
concentrated alkali, has been extended to 3- nitro4- methylphenyla.rsonic with the formation of 3- amino4- carboxyphenylarsonic acid.
II. The synthesis of 3- amino, 4- amino -, 3 methy 1 -4-
amino-, 2- amino -3- methyl, 1- methyl -4- amino -, and 7-
nitro-3- bromoacridone is described and a review is
made of the effect of the nature and position of
substituents on the cyclisation of substituted
diphenylamine -2- carboxylic acids.
III. The methods of synthesis of acridone arsonic
acids are reviewed and examined, and the preparation
of acridone -3 -, acridone-4-, nitroacridone -3 -, and
3- methylacridone -2- arsonic acids described.