Organometallic complexes pyrazole

Organometallic Complexes of Polyheteroatom Azoles Other than Pyrazole... 

The third chapter of Volume 83 of Advances in Heterocyclic Chemistry is Part 5 in the series by Alexander Sadimenko (Fort Hare, Republic of South Africa) and covers organometallic complexes of azoles other than pyrazoles. This chapter continues the series of which parts 1-4 were published in volumes 78, 79, 80, and 8l of Advances in Heterocyclic Chemistry, respectively. 

Cyclooctane-l,5-diyl-bis(pyrazol-l-yl)borate (L) with cobalt(II), nickel(II), and zinc(II) nitrates gives [(j -L)M] (M = Co, Ni, Zn) strongly stabilized by the C—H M agostic interactions, which justifies their inclusion in the class of organometallic complexes [89AGE205, 91ICA(183)203, 92IC974]. 

Sadimenko, A. P., Organometallic Complexes of Polyheteroatom Azoles Other than Pyrazole, 83, 117. 

A. P. Sadimenko Organometallic complexes of heterocycles II. Complexes of pyrazoles 1996CCR247... 

Organometallic complexes of polyheteroatom azoles other than pyrazole 02AHC(83)117. 

Organometallic complexes as anion hosts (Anionic tris(pyrazolyl)borate ligands and cationic tris(pyrazole) receptors) / V. H—B-N—NH ---yci [ J + [Aicy- 41... 

In reactions with secondary amines containing a second nitrogen atom, the diphenylallenylidene ligand of 43 is active not only at the C -Cp double bond but also at the atom. Thus, the addition of pyrazoles to solutions of 43 leads to the pyrazolo[l,2-a]pyrazolyl complexes 85-87 (Scheme 25). Complexes 85 and 87 yield the functionalized alkynyl derivatives 88 and 89 by treatment with sodium methoxide. The formation of 85-87 involves novel 1,2,3-diheterocyclization reactions, where an organometallic complex is used for the first time [34]. 

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