Abstract
New square-planar copper(II) complexes of 18-membered decaaza macrocyclic ligands: 5,6,14,15-tetramethyl-1,3,4,7,8,10,12,13,16,17-decaazacyclooctadecane (Me4[18]aneN10); 1,10-dimethyl-(Me2Me4[18]aneN10); 1,10-diethyl-(Et2Me4[18]aneN10); 1,10-dipropyl-(Pr2Me4[18]aneN10); 1,10-dibutyliso-(Bu2Me4[18]aneN10) and 1,10-dibenzyl-5,6,14,15-tetramethyl-1,3,4,7,8,10,12,13,16,17-decaazacylooctadecane [(Benzyl)2Me4[18]aneN10)] have been prepared by a one-pot template condensation of formaldehyde and 2,3-butanedihydrazone with alkyl and benzylamine in the presence of copper(II) ion. The complexes of the decaaza macrocycle have been characterized by elemental analyses, i.r., u.v.–vis., conductometric and magnetic measurements. The spectra of [Cu(R2Me4[18]ane N10)](ClO4)2shows that the four nitrogen (α-diimine) atoms are coordinated to the copper(II) ion. These complexes are found to be effective catalysts for the selective oxidation of tetrahydrofuran to yield the corresponding tetrahydrofuran-2-one and a small amount of tetrahydrofuran-2-ol and 4-hydroxybutyraldehyde, using diluted H2O2 as the oxidant.
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Salavati-Niasari, M., Rezai-Adaryani, M. & Heydarzadeh, S. Copper(II) complexes with 18-membered decaaza macrocycles: synthesis, characterization and catalytic activity. Transition Met Chem 30, 445–450 (2005). https://doi.org/10.1007/s11243-005-1017-2
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DOI: https://doi.org/10.1007/s11243-005-1017-2