Copper (II) Complexes of the 14-membered hexaaza-macrocycles; 1, 8-dimethyl-; 1, 8-diethyl-; 1, 8-dipropyl-; 1, 8-dibutyliso-; 1, 8-dibutylsec- and 1, 8-dibenzyl- 1, 3, 6, 8, 10, 13-hexaazacyclotetra decane ([Cu{R2[14]aneN6}](ClO4)2) catalysed efficiently the selective oxidation of tetrahydroforan into the corresponding γ-butyrolactone and a small amount of tetrahydrofuran-2-ol and 4-hydroxybutyraldehyde, using dil. H2O2 as the oxidant. The conversion of this catalytic oxidation process can reach 98.6% when [Cu{(Benzyl)2 [14] ane N6}](ClO4)2 is used.
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