The use of chlorosulfonic acid as a tool for the characterization of organic compounds whose application to the identification of aryl halides was reported in the first paper3 of this series has now been extended to thirty-six aromatic ethers. The principle employed is twofold: first, introduction of one sulfonyl chloride group into each aromatic nucleus by direct treatment with chlorosulfonic acid, and, second, conversion of the resultant sulfonyl ...