Iron methoxide

Iron(III) complexes, tetraphenylporphyrinatobenzene-thiolatobenzenethiol-, 517 Iron(IV) complexes phosphines SHAB theory, 1040 Iron cupferronate structure, 510 Iron methoxide physical properties, 346 Iron pivalate basic, 303 Iron proteins iron-sulfur group, 773 Isobacteriochlorins, 851 Isobutyric acid, hydroxy-metal complexes IR spectra, 470 Isobutyric acid, 2-hydroxy-metal complexes NMR, 467 Isocitric acid... 

The iron methoxide precipitates from the solutions in alcohol only as insoluble Fe(OMe)3MeOH, which easily loses solvating alcohol yielding Fe(OR)26O02 [1365,1432]. It can therefore be supposed that the Fe(OMe)3 samples described in the literature [5-7, 867, 228], that were obtained by long-term drying in vacuo, did contain oxoligands. 

In a recent discussion of the spectra of haem-compounds, one of us (10) suggested that d—d transitions, as well as charge transfer bands, could be responsible for part of the near infra-red absorption, and that n—ji triplets could also be involved. In particular this could be the case for the weaker bands in the mesoporphyrin iron methoxide spectrum. The strongest band in the near infra-red, which is the only one seen clearly in haemoproteins, is very probably largely charge transfer. The... 

Hydroxy-substituted iron-acyl complexes 1, which are derived from aldol reactions of iron-acyl enolates with carbonyl compounds, are readily converted to the corresponding /i-methoxy or /1-acetoxy complexes 2 on deprotonation and reaction of the resulting alkoxide with iodomethane or acetic anhydride (Tabic 1). Further exposure of these materials to base promotes elimination of methoxide or acetate to provide the a,/ -unsaturated complexes (E)-3 and (Z)-3 (Table 2). 

The mineralized core of ferritin can be modeled by mixed valence species such as [Fe 4-Fe g02(0Me)i8(02CMe)6]-4.67MeCN, whose 3D close-packed layer structure mimics ferritin. This compound can be prepared by oxidizing a methanolic solution of iron(II) acetate and lithium methoxide with a slow stream of dioxygen it can be reduced to give [Fe 2Fe o02-(0Me)i8(02CMe)g]2-.i ... 

The magnetic properties of large oxo-iron clusters, with auxiliary hydroxide, methoxide, or... 

Azepines do not undergo electrophilic substitution reactions and introduction of substituents at the 3-or 4-position is a difficult problem. Acylation at C-3 can be achieved via the iron tricarbonyl complex as shown in Scheme 22.42 The N-ethoxycarbonyl group of the acylated product can be removed with methoxide methanol and the resulting 1H compound can then be methylated. 

The known Fe(OAlk)2 are green polymeric substances. The diffuse reflectance spectrum of Fe(OMe)2 indicates the octahedral coordination of iron atoms [6], According to the X-ray powder data its structure is isomorphous to those of other divalent metals, — i.e., resembles that of Fe(OH)2 (Mg(OH)2 type) [1656], The solubility is characteristic only of the derivatives of rather branched radicals — CH2Ph, CPh3 [114,941] — or of the phenoxides solvated by such bulky ligand as Dipy [941], The octahedral coordination is observed not only for the methoxide but quite unexpectedly for the derivatives 3,5-sus-... 

Epoxidation of cyclooctene with hydrogen peroxide, catalysed by the methoxide-ligated form of iron(III) tetrakispentafluorophenyl [F20TPPFe(III)] porphyrin, is proposed to involve a reaction of F20TPPFe(in) with hydrogen peroxide to form an iron(III) hydroperoxide species, which then undergoes both heterolytic and homolytic cleavage to form iron(IV) n -radical cations and iron(IV) oxo species, respectively. 

Formation of an Iron Complex of an N-alkyl Porphyrin ir-Radical (46, 52). In the absence of sodium methoxide, the reaction between (N-MeTTP)FenCl and m-CPBA takes two different paths. When 1.1 equivalents of the peroxy acid are added, the Fe11 complex is converted into a high-spin, five-coordinate Fem complex. However,... 

The simple haem mesoporphyrin IX iron(III) methoxide has a relatively weak near infra-red band at 13.1 kK (101). The region 8—10 kK can then be studied in more detail. This compound is essentially high-spin (8, 87, 101) and the crystal structure is known in detail (8). The polarized crystal spectrum in the region 5—12 kK has been measured (96) and all the bands are in-plane polarized. Peaks are seen at 11.4, 9.3, 8.3 and 7.2 kK, with a shoulder at 10.2 kK. The bands are so evenly spaced as to suggest a vibrational progression, and the interval of about 1.1 kK is about the same as the usually a—/J separation in typical metalloporphy-rin spectra. This absorption could be due to the low-spin form the extinction coefficients are around 50, and protoporphyrin IX iron(III) methoxide, which has a very similar visible spectrum (101), has a magnetic moment (8) which suggests the presence of some 20% of the low-spin form. 

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