Pyridine oxide complexes

X0 complexes, 37 272-282 phosphine complexes, 37 271-274 phosphite complexes, 37 272, 274 prophyrin and phthalocyanine complexes, 37 251-253 pyridine oxide complexes, 37 284 2-pyridinethiolato, 2-pyrimidinethiolato, and thiopyrine complexes, 37 295-296... 

Ligands having oxygen as donor atom are also able to form many complexes with Zn and Cd. These include phosphine oxide complexes such as tetrahedral [Zn(0PPh3)4](C104)2,67 pyridine oxide complexes, the simplest of which is [Cd(pyO)6][CdCl4],68 alkoxides, M(OR)2, carbamates,69 and phosphates.70... 

The metal co-ordination in the pyridine oxide complexes (78) and (79) shows interesting differences. In (78) the metal adopts a distorted square-pyramidal configuration. The apical Cu-CI distance of 2.354(3) A is longer than the corresponding basal distance of 2.258(3) A, and the terminal Cu-O bond of 1.925(5) A is shorter than those involved in the bridging unit. The basal O3CI unit is planar to 0.2 A, with the metal displaced from it by 0.44 A. The crystal structure of (79) contains two independent... 

Pyridine 1-oxide, like pyridine, can act as a ligand in transition metal complexes, but unfortunately good stability constants are not known. However, Shupack and Orchin have found that the C===C stretching frequency of the ethylene ligand in trans-ethylene pyridine 1-oxide dichloroplatinum(II) varies linearly with the pA and hence with the C7-value (ct+ or a, respectively) of substituents in the pyridine oxide. The data for the above reaction series are included in Table V. 

Purex process, 6,940 Barium, pentakis(diacetamide)-stereochemistry, 1, 99 Barium alkoxides synthesis, 2,336 Barium complexes cryptands, 3,53 phthalocyanines, 2, 863 porphyrins, 2,820 pyridine oxide, 3,9 urea, 3,9... 

Calcium-binding proteins, 6, 564, 572, 596 intestinal, 6, 576 structure, 6, 573 Calcium carbonate calcium deposition as, 6, 597 Calcium complexes acetylacetone, 2, 372 amides, 2,164 amino acids, 3, 33 arsine oxides, 3, 9 biology, 6, 549 bipyridyl, 3, 13 crown ethers, 3, 39 dimethylphthalate, 3, 16 enzyme stabilization, 6, 549 hydrates, 3, 7 ionophores, 3, 66 malonic acid, 2, 444 peptides, 3, 33 phosphines, 3, 9 phthalocyanines, 2,863 porphyrins, 2, 820 proteins, 2, 770 pyridine oxide, 3,9 Schiff bases, 3, 29 urea, 3, 9... 

Strontium, aquatetrakis(diacetamide)-structure, 1,98 Strontium, heptaaqua-dodecaiodide structure, 1, 72 Strontium, octaaqua-structure, 1, 84 Strontium alkoxides synthesis, 2,336 Strontium complexes porphyrins, 2, 820 pyridine oxide, 3, 9 Structure... 

In contrast with former opinions about the reaction mechanism in KF titration, more recent investigations by Verhoef and co-workers146 have shown that neither S02 nor a pyridine-S02 complex is oxidized by iodine in the presence of water, but the monosulphite ion ... 

It effectively hydroxylates hydrocarbons but is free of the explosion risk of the analogous pyridine /V-oxide complex. 

The oxidation of butanone-2, catalyzed by complexes of pyridine with cupric salts, appeared to be similar in its main features [191]. Butanone-2 catalytically oxidizes to acetic acid and acetaldehyde. The reaction proceeds through the enolization of ketone. Pyridine catalyzes the enolization of ketone. Enole is oxidized by complexes of Cu(II) with pyridine. The complexes Cu(II).Py with n = 2,3 are the most reactive. Similar results were provided by the study of butanone-2 catalytic oxidation with o-phenanthroline complexes, where Fe(III) and Mn(II) were used as catalysts [192-194],... 

The benzyl ligand of benzylbis(dimethylglyoximato)pyridine cobalt complex has been selectively converted to 3,5-dibenzyl-l,2,4-oxadiazole by a reaction with alkyl nitrite in the presence of light (426). The reaction proceeds by the in situ formation of an oxime and a nitrile oxide (Scheme 1.44). 

Intramolecular Lewis base complexation of the germanium atom also did not appear to be a valuable alternative to overcome the lability of these elusive intermediates, since the germanones expected from oxidation of the base-stabilized germylenes 140131 (with Me3NO) and 141132 (with 02, DMSO, or pyridine oxide) either rearrange as already mentioned [Section VI,A,4, Eq. (33)]131 or dimerize to digermadioxetane 160132 [Eq. (35)]. 

The behavior of the aldehyde complex toward Lewis bases was examined. The acetaldehyde moiety in the acetaldehyde complex Me2A10CPhNPh MeCHO was not displaced by a large excess of Lewis base such as pyridine or tetrahydrofuran, but was replaced by a strong electron donor substance such as trimethylamine oxide to give a crystalline trimethylamine oxide complex, Me2A10CPhNPh ONMe3, which is identical to that obtained from trimethylamine oxide and [Me2AlOCPhNPh]2. 

---