ANILINES AS MARKING AGENTS FOR MINERAL OILS

摘要

The use of anilines of the formula (I) in which R<1> and R<2> are hydrogen, possibly substituted alkyl, alkenyl, possibly substituted phenyl or R<1> and R<2> together with the nitrogen atoms bonding them are a hetercocyclic residue or R<1> is also a possibly substituted hydroxy or possibly substituted amino; R<3> and R<7> are hydrogen, possibily substituted alkyl, alkenyl, cyano, nitro, acyl, acylamino possibly substituted hydroxy, possibly substituted carboxy methyl, possibly substituted amino, possibly substituted mercapto or possibly substituted sulphamoyl or together with R<2> are alkylene or alkenylene or phenyl alkenylene; R<4> is hydrogen, possibly substituted alkyl, alkenyl, possibly substituted hydroxy, possibly substituted amino, possibly substituted carboxyl or possibly substituted sulphamoyl; and R<5> and R<6> are hydrogen possibly substituted alkyl, alkenyl, possibly substituted phenyl, nitro, acylamino, possibly substituted hydroxy, possibly substituted amino, possibly substituted sulphamoyl, alkyl, sulphonyl, alkenyl, sulphonyl or aryl sulphonyl, acyl or possibly substituted carboxyl; provided that at least one of the residues R<3>, R<5> or R<7> is hydrogen, for marking mineral oils, mineral oils marked with the above anilines and a process for detecting the above anilines in mineral oils are disclosed.