The Mechanism of Dyeing with Procion Dyes II—The Mechanism of Reaction with Water and Soluble Alcohols or Carbohydrates

The rates of reaction of a series of dichloro‐s‐triazine dyes with water have been measured. The rate constants obtained at constant pH are pseudo‐unimolecular. When the true second‐order constants are calculated, allowing for the pH, it is found that the results are best interpreted on the basis that the dye reacts with ionised hydroxyl groups. Similarly, the reaction of a monochloro‐s‐triazine dye with mannitol or methanol is best explained in terms of a mechanism involving the dye and the ionised hydroxyl group of the alcohol.