Hydrogen sulfide scavengers

A method of sweetening a fluid or gas, comprising treating the fluid or gas with an effective amount of a composition comprising one or more compounds of formula (I),

• wherein
• R1, R2, and R3 are each independently selected from the group consisting of hydrogen, alkylenyl, alkenylenyl, alkynylenyl, alkyl, alkenyl, and alkynyl, wherein said alkylenyl, alkenylenyl, alkynylenyl, alkyl, alkenyl, and alkynyl are each independently, at each occurrence, substituted or unsubstituted with one or more suitable substituents;
• k, l, and m are each independently an integer selected from the group consisting of 0 to 25, wherein k+l+m is >0;
• and
• x, y, and z are each independently an integer selected from the group consisting of 0 and 1, wherein x+y+z is 1, 2, or 3;
• provided that:
• when x is 0, R1 is hydrogen, alkyl, alkenyl, or alkynyl;
• and when x is 1, R1 is alkylenyl, alkenylenyl, or alkynylenyl;
• when y is 0, R2 is hydrogen, alkyl, alkenyl, or alkynyl;
• and when y is 1, R2 is alkylenyl, alkenylenyl, or alkynylenyl;
• when z is 0, R3 is hydrogen, alkyl, alkenyl, or alkynyl;
• and when z is 1, R3 is alkylenyl, alkenylenyl, or alkynylenyl.