Abstract: The invention relates to surfactants of the formula (I), in which R1 stands for —H or —CH3; R2, R3, R4, R5, R6 independently stand for —H, —CH3, —CH2CH3, —CH2CH2CH3, —CH(CH3)2, —CH2CH2CH2CH3, —CH2CH(CH3)2, —CH(CH3)CH2CH3, —C(CH3)3, —OH, —OCH3, —OCH2CH3, —OCH2CH2CH3, —OCH(CH3)2, a linear or branched alkyl group containing 8 to 20 C atoms, or —SO3?X+; X+ stands for a monovalent cation or the nth part of an n-valent cation; exactly one radical R2, R3, R4, R5, R6 stands for —SO3?X+; and exactly one radical R2, R3, R4, R5, R6 stands for a linear or branched alkyl radical containing 8 to 20 C atoms.