Ot-Picoline

Mixed donor ligands. The complex [FeL3]Cl3 (L = acetylhydrazine) contains the ligand in its bidentate form, bonded via the carbonyl and primary amino-groups.Pyridine-2-carboxaldehyde and l,l,l-tris(aminoethyl)ethane react with Fe" via a template reaction to form [Fejlpyljltame) ], in which three molecules of carboxaldehyde have condensed with one molecule of triamine to produce (pyljltame). MeC(CH2N=CH-oc-py)3 the complex cation is octahedral. The complexes [FeL ] (L = l,10-phenanthroline-2-carboxamide, n = 1 or 2) have been isolated they are both six-co-ordinate. Very weak d-d bands have been identified in the spectra of complexes of ot-picolinic acid and quinaldic acid with Fe". ... 

The aliphatic hydrogens of ot-picoline (1) are relatively acidic, so that treatment with phenyl lithium... 

Reactivity Acrolein is a highly reactive chemical, and contamination of all types must be avoided. Violent polymerization may occur by contamination with either alkaline materials or strong mineral acids. Contamination by low molecular weight amines and pyridines such as Ot-picoline is especially hazardous because there is an induction period that may conceal the onset of an incident and allow a contaminant to accumulate unnoticed. After the onset of polymerization the temperature can rise precipitously within minutes. 

Using HPW as a molecular tether to form highly stable crystal materials, Sarkar et al.220 prepared the palladium complex [Pd(pyca)(PPh3)(OTs)] (pyca = 2-picolinate) immobilised on zeolite NaY. From the 31P SS NMR data, it was concluded that the Pd complex is attached to the surface of zeolite by the HPW via some ionic interactions. Moreover, neither the support nor the molecular tether (HPW) undergoes any form of degradation during synthesis. This kind of material can be explored as a catalyst for acid-free carbonylation reaction. 

The DTA curves for both ot- and P-picoline (pi) platinum(Il) coordination compounds, -[PtlpOjCy, showed [36] exothermic peaks at 478 K which are caused by isomerization to the more stable trms isomer. At higher temperatures the organic ligand was released to yield RClj. The pyridine (py) compound cis-[Pt(py)2BrJ behaves similarly undergoing an exothermic transformation to the tram form at 528 K, prior to dissociation at 553 K. 

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