Table 7: Effect of solvent on the catalytic activity of benzyl alcohol oxidation by Cr(II) complexes at optimum conditions.


Catalyst Solventa Yield (%) Conversion (%) Selectivity (%)
BAb BZc Side products R

CrLA1 CH2Cl2 53 3 31 13 87 61
Acetone 67 6 18 9 91 74
CHCl3 25 3 84 24 76 33
DMF 100 100 0
CrLA2 CH2Cl2 40 2 39 19 81 49
Acetone 57 5 23 16 84 68
CHCl3 24 1 55 20 80 30
DMF 96 4 96 0
CrLA3 CH2Cl2 36 2 31 31 69 50
Acetone 51 4 17 28 72 71
CHCl3 15 3 48 34 66 23
DMF 89 11 89 0

aThe oxidation of benzyl alcohol (R) (1.0 mmol) catalyzed by complex CrLA2 (0.02 mmol) with aqueous H2O2 (3.00 mL) in 10 mL acetonitrile for 1–6 h.
bThe yield based on GC results, selectivity percentage of the target oxide product BA and the other product BZ.
cThe other side products are mainly of BZ.