An Efficient Oxidation of Benzoins to Benzils by Manganese(II) Schiff Base Complexes Using Green Oxidant

Table 3

Oxidation of benzoin derivatives using H₂O₂ in the presence of Mn(II) Schiff base complex in CH₃CN at room temperature.

	R^1	R^2	Time; (min)	Yield^a; (%)	mprep/mplit. (°C)
a	H	H	25	98	92–95/94–96 [24]
b	4-OCH3	4-OCH3	20	91	133–135/132–134 [24]
c	4-NCH3	H	30	70	117-118/115-116 [24]
d	4-CH3	4-CH3	23	78	103–105/101–104 [24]
e	4-OCH3	H	20	85	65–67/62-63 [24]
f	NC5H5	NC5H5	22	89	119–121
g	2,4-diOCH3	2,4-diOCH3	35	73	195–197
h	H	3-OCH3	21	58	133-134/133 [24]
i	H	4-CH3	26	84	27-28/31 [24]
j	4-CH3	3-Br	30	45	141-142

^aIsolated yields.