Acid-labile surfactants

A compound of formula (I):

• or a salt thereof, wherein:
• A is selected from:
• R1 is selected from hydrogen, C1-C12 alkyl, C2-C12 alkenyl, and C1-C12 haloalkyl;
• R2 is selected from C4-C20 alkyl, C4-C20 alkenyl, and C4-C20 haloalkyl;
• each R3 is independently selected from C1-C12 alkyl, C2-C12 alkenyl, and C1-C12 haloalkyl;
• m is 1, 2, or 3;
• Ra and Rb, at each occurrence, are independently selected from hydrogen and C1-C3 alkyl;
• Q is selected from C1-C6-alkylene, and C1-C6-hydroxyalkylene;
• or the group -Q-SO3M has a formula:
• and
• each M is independently selected from hydrogen, an alkali metal cation, and NR4+, wherein each R is independently selected from hydrogen and C1-C12 alkyl.