Photoredox catalysts and methods of using such catalysts

A photoredox catalyst comprising Formula (I) or a salt thereof:

• wherein:
• A is selected from an optionally substituted C1 to C16 alkyl, an optionally substituted aryl, an optionally substituted heteroaryl, a halogen, —CN, —OR3, —C(O)R3, —C(O)OR3, —C(O)NR4R5, —NO2, —NR4R5, —SR3, —S(O)R3, —S(O)2R3, C1 to C8 substituted alkyl, C1 to C8 unsubstituted alkyl;
• R3 is selected from —H, —NR4R5, C1 to C8 substituted alkyl, or C1 to C8 unsubstituted alkyl, substituted aryl, unsubstituted aryl, substituted heteroaryl, or unsubstituted heteroaryl;
• and
• R4 and R5 are each independently selected from —H, C1 to C8 substituted alkyl, C1 to C8 unsubstituted alkyl, substituted aryl, unsubstituted aryl, substituted heteroaryl, or unsubstituted heteroaryl;
• and
• R2 is selected from an optionally substituted C1 to C16 alkyl, an optionally substituted aryl, or an optionally substituted heteroaryl.