| abstract |
A process for preparing compounds of the general formula (1) by reacting the compound of the general formula (11) where L, L' are the same or different and are each independently Cl or OH in the presence of a. chlorine compounds Cl-M2R1R2R3, Cl-M3R4R5R6, with the proviso that L and L' are not both simultaneously OH, or b. hydroxyl compounds HO-M2R1R2R3, HO-M3R4R5R6. The use of compounds of the general formula (1) as markers for liquids and a process for detecting markers in liquids. |