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Epoxidation of natural terpene (+)-carvone by the system consisting of a catalyst, oxalic acid (co-catalyst) and H 2 O 2 (70% aqueous solution; oxidant) was studied and factorial design methods were applied for the optimization of this reaction. A dinuclear manganese(IV) complex [LMn(O) 3 MnL](PF 6 ) 2 (L = 1,4,7-trimethyl-1,4,7-triazacyclononane) was used as a catalyst, and acetonitrile was employed as a solvent. An analysis by methods of the complete 2 4 factorial design showed that an increase in the catalyst concentration gives a strong positive effect on the carvone conversion and selectivity. Hydrogen peroxide has a smaller positive effect on the conversion, but at high concentration, H 2 O 2 leads to some decrease in the selectivity. An increase in the oxalic acid concentration has a beneficial effect on the conversion, but does not affect the selectivity. **Part 7 of the series "Oxidations by the system hydrogen peroxide-[Mn 2 L 2 O 3 ][PF 6 ] 2 (L = 1,4,7-trimethyl-1,4,7-triazacyclononane)-carboxylic acid". For parts 1-6, see , respectively. The present work was reported at the