TABLE 1.

Possible H-abstracting species

	0 e−	1 e− (CuH → CuM)
0 H+	[CuO2]+	[CuO2]0
1 H+	[CuOOH]2+	[CuOOH]+
2 H+	[CuO]3+ + H2O	[CuO]2+ + H2O