Preferably, mesogenic hydroxy compounds (III) and acid chlorides (IV; Xf =Cl) are used for preparing the compounds, the reaction taking place in the presence of acid acceptors such as amines, for example pyridine or triethylamine, or of alkali metal or alkaline earth metal (hydrogen) carbonates, in general at temperatures between -40??? C. and +70??? C. It is also possible, however, to react the m