Processes for preparing and using tanning agents and preservatives

摘要

A process for the preparation of aqueous formulations, and aqueous formulations so prepared, the process comprising heating at least one cyclic compound of the formula I in the presence of water and of an acidic catalyst and, during or after the heating, H-X-R³ is at least partially separated off, where, in formula I, X is selected from oxygen, sulfur and N-R⁶, R¹-R⁶ are as defined, and n is an integer from 1 to 4.