Pyrazolato, copper complexes

HOMOGENEOUS CATALYTIC OXIDATION OF ORGANIC SUBSTRATES BY COPPER-PYRAZOLATO COMPLEXES... 

Indeed, some copper-pyrazolato complexes allowed the catalytic oxidation of organic substrates such as primary and secondary amines, isocyanides and phosphines in mild conditions. 

The pyrazolato copper(I) complex, [Cu(pz)] (Hpz = lH-pyrazole), and related copper(I) complexes having different substituents on the pyrazole ring are well known.1,2 For these pyrazolato derivatives, various synthetic routes have been reported. However, the methods are, in general, complex and do... 

The aforementioned pyrazolato copper(I) complexes, [Cu(pz)] , [Cu(dcmpz)] , and [Cu(dppz)]4 are prepared analogously. [Cu(dctpz)]n is prepared by using ethanol instead of acetone, because of its high solubility in the latter solvent. ... 

TABLE I. Significant IR Absorptions of Pyrazolato Copper(I) Complexes... 

Figure 10. Drawing of the dinucleating ligands utilized in the magnetostructural correlations on copper(ll) pyrazolato complexes.

In an attempt to gain more insight into the reactions of copper(I) pyrazolato complexes with dioxygen, we decided to use different pyrazoles, whose donor capabilities were modified by introducing substituents in the 3,5-positions. 

BN RhC44HM, Rhodium , tetrakis(l-isocy-anobutane)-, tetraphenylborate(l -), 21 50 BN C Hio, Borate(l -), hydrotris(pyrazolato)-, copper complex, 21 108 BN6Ci5H22, Borate(l -), tris(3,5-dimethylpyr-azolato)hydro-, copper complex, 21 109 BN8Ci2Hi2, Borate(l-), tetrakis(pyrazolato)-, copper complex, 21 110 BjFeN CjoH,, Iron(II), [tris[p.-[(l,2-cy-clohexanedione dioximato)-0 0 ]diphenyl-diborato(2 — )]-NJI JI" X " JI"",... 

As a part of a systematic study of the chemical and structural properties of new and already known copper complexes containing pyrazolato groups as ligands, we have extensively explored the reactivity of such systems with respect to dioxygen, with the aim to ascertain their potential catalytic properties. 

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