STUDIES ON OPTICAL ACTIVITY AND CHEMICAL CONSTITUTION. PART V. ROTATORY POWERS OF CAMPHORANILIC ACIDS, α- AND β-NAPHTHYLCAMPHOR-AMIC ACID AT VARIOUS DEGREES OF NEUTRALISATION.

The rotatory powers of camphoranilic acid, 2-', 3-', 4'-methylcamphoranilic acids and α- and β-naphthylcamphoramic acids have been determined at various degrees of neutra­lisation. In every case the alkali salts have greater rotatory power than the acid. In some cases there is a sudden fall at the half neutralisation point and then a progressive increase till the complete neutralisation point. In other cases, after a gradual increase the rotatory powers become constant and then increase till the acid is completely neutralised