Abstract
Methane, benzene, and p-toluene sulphonic acids react instantaneously at room temperature with dicyclohexyl and di-p-tolyl carbodiimides to form the corresponding sulphonic anhydrides, VI, and disubstituted ureas, VII. The use of di-p-tolyl carbodiimide affords a convenient general method of preparation of sulphonic anhydrides.

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