Nickel complexes hydrazone

No isomers were detected in the copper and nickel complexes of the strongly polarized o,o -dihydroxyazobenzene (89), the l-(2-hydroxyphenylazo)-2-naphthols (90), or the 1-phenyl-3-methyl-4-(2-hydroxyphenylazo)-5-pyrazolones (91). These compounds exist predominantly in the quinone hydrazone (92 and 93) and ketone hydrazone (94) forms, respectively (Section... 

Copper and nickel Chromium and cobalt N -Np Na-Np Meridional/facial coordination Azo/hydrazone tautomerism Non-planarity due to azo/hydrazone tautomerism Formation of two copper and two nickel complexes by unsymmetrical o.o -dihydroxyazobenzenes78 Detection of isomeric 2 1 chromium complexes 79 proton magnetic resonance80 Isolation of isomeric 2 1 chromium and cobalt complexes 86 87 limited X-ray crystallographic89 90 Proton magnetic resonance80 Detection of five isomeric 2 1 chromium complexes of symmetrical o.o -dihydroxydiarylazo compounds... 

A series of complexes of 2-carbonyl derivatives of 3-hydroxybenzo[b]thiophene 679, its imines 680 (R/ = Ph) [250] and hydrazones 680 (R = NR2R3) [251], as well as pyperidine adduct of nickel complex 681 [252], have been isolated in methanol-ethanol mixture ... 

Very few discogenic complexes with a hydrazone moiety have been so far studied. One nickel complex based on 2,6-diacetylpyridinebis(3,4,5-tridodecyloxybenzoylhydrazone) has been previously reported by Battistini et al. as a potential columnar metallomesogen." The mononuclear complex showed an apparently unidentified mesophase during the first heating which was not... 

Benzaldehyde monohydrazone, 2,3-butanedione monohydrazone and related hydrazones have been found to react with some ketones in the presence of nickel(II), affording compounds which, in turn, condense with either en or propane-1,2-diamine giving macrocyclic complexes (Scheme 49).2656 2657... 

The reaction of the nickel(II) perchlorate complex (89) with acetone and related ketones yields simple hydrazone complexes rather than macrocyclic complexes resulting from a Curtis-type reaction. Acetylacetone also fails to bridge the bis(hydrazine) and instead yields a pyrazole derivative (Scheme 37).197 198 In contrast to this result, 1,4-dihydrazinophthalazine undergoes a template reaction with 2,2-dimethoxypropane, a source of acetone, in the presence of nickel(II) fluoroborate and a trace of fluoroboric acid (Scheme 38).199... 

The nickel(n) complex of the 02N2 quadridentate (132) derived from benzil mono-hydrazone reacts with en or 1,2-pn at room temperatures, to produce complexes... 

A very interesting report of a nickel-catalyzed ATH of hydrazones and related substrates has been published. Using a complex formed from a combination of (S)-... 

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