hydroxylation reactions. While the radical based mechanisms are more difficult to identify, the reactions that go through a copper bis(μ-oxido) complex as active species can be analyzed by low temperature stopped-flow techniques. In an ideal case the formation and decomposition of this reactive intermediate can be spectroscopically observed. It was shown that this depends strongly on the ligand system: steric effects
Imines are important N-containing intermediates in organic synthesis. The photocatalytic production of specific iminesthroughdirect coupling of alcohols and amines under mild conditions has been widely explored. However, the reported processes are not practical due to negative factors such as low photocatalytic efficiency, involvement of non-stoichiometric raw materials, limited scope of substrates
The synthesis and structural determination by X-ray crystallography of four amide copper(II) complexes has been performed: [CuOC[(CH2)2N(CH2C6H4X)(CH2CH2C5H4N)]NH(CH2)nPh}(solv)][CF3SO3]2 (X=H, solv=H2O, n=2 1 or 1 2; X=OH, solv=H2O, n=23; solv=MeCN, n=1 4). In all complexes the co-ordination around the copper atom is a more or less distorted square-based pyramid where the three ligands of the square are unchanged: one oxygen atom of the amide group and two nitrogen atoms of the pyridine nucleus and of the tertiary amine. The fourth ligand is a water molecule (1-3) or an acetonitrile solvent molecule (4). The axial ligand is the oxygen atom of the phenolic group in complexes 3 and 4, while in 1 and 2 this site is occupied by an oxygen atom of a triflate counter ion.