Polyphosphoric Acid as a Reagent in Organic Chemistry. V. Conversion of Acids to Substituted Amides ; Further Observations on the Lossen Reaction BY H. R. SNYDEU AND CLAYTON T ELSTON' RECEIVED JANUARY 21, 1954 In an earlier paper2 it was postulated that the re- action of hydroxylamine with aromatic carboxylic acids in the presence of polyphosphoric acid pro- ceeds to the amine by way of an intermediate hy- droxamic acid. In agreement with this ...
