Iron complexes iodide

Iron(II) formate dihydrate, 14 537 Iron(II) fumarate, 14 537 Iron gelbs, 19 399, 400 Irondl) gluconate dihydrate, 14 541 Iron group carbides, 4 690-692 Iron halides, 14 537-540 Iron hydroxide, water exchange rates and activation parameters of hexaaqua complexes, 7 589t Iron(II) hydroxide, 14 542 Iron(III) hydroxide, 14 542 Iron hydroxides, 14 541—542 Iron(II) iodide, 14 540 Iron(III) iodide, 14 540 Iron/iron alloy plating, 9 813—814. See also Fe entries... 

Removal of the 0-substituted Fp group can be achieved by conversion into the cationic alkene-Fp complex using Ph3CPF6 and subsequent treatment with iodide, bromide or acetonitrile. Oxidative cleavage with ceric ammonium nitrate in methanol provides the methyl esters via carbon monoxide insertion followed by demetallation. The [3 + 2]-cydoaddition has been successfully applied to the synthesis of hydroazulenes (Scheme 1.11) [34]. This remarkable reaction takes advantage of the specific nucleophilic and electrophilic properties of V-allyl-, cationic t 5-dienyl-, cationic ri2-alkene- and ti4-diene-iron complexes, respectively. 

A notable feature in all these coupling protocols is that the coupling rates of iron-phosphorus systems, of the (salen)iron complex 5, the Fe(acac)3 catalyst, and catalyst 10 with respect to the alkyl halide are rather uncommonly bromide> iodide>chloride (entries 3, 4, 9, 13), whereas the reactivity order for iron-amine catalyst systems is iodide>bromide>chloride (entries 1, 5, 6). 

Alkenes. This reagent reacts with an alkyl bromide (or tosylate) to form an iron complex of type 2. Treatment with trityl tetrafluoroborate in CH2CI2 at 0 abstracts a hydride ion from a /3-carbon atom of 2 to form an alkene iron complex (3). The alkene 4 is liberated quantitatively and without isomerization by treatment with sodium iodide in acetone." Because of the size, (C6H5)3C" abstracts a hydride ion preferentially from a methyl rather than a methylene group. In addition, electronic factors may be involved. This elimination reaction is therefore useful for preparation of 1-alkenes. 

To make the reactive fulleride compound KeCeo in the Fe-Ceo synthesis, fullerenes and a slight excess of potassium were sealed in a glass tube under vacuum and heated for approximately four days at 250 °C. Both solid-state NMR and Raman spectroscopy were employed to determine that the KeCeo compound was in fact synthesized. The KeCeo product was then reacted in an inert atmosphere with cyclopentadienyl-iron-dicarbonyl-iodide (CpFe(CO)2l) in tetrahydrofuran (THF) to form the complex. The recovered product was dried in an inert atmosphere. Manipulations of air-sensitive materials were carried out in a glove box or using standard Schlenk techniques. THF was distilled just prior to use from sodium benzophenone ketyl. Ceo was obtained from Aldrich, and CpFeCCOjol was obtained from Strew. 

Redfield limit, and the values for the CH2 protons of his- N,N-diethyldithiocarbamato)iron(iii) iodide, Fe(dtc)2l, a compound for which Te r- When z, rotational reorientation dominates the nuclear relaxation and the Redfield theory can account for the experimental results. When Te Ti values do not increase with Bq as current theory predicts, and non-Redfield relaxation theory (33) has to be employed. By assuming that the spacings of the electron-nuclear spin energy levels are not dominated by Bq but depend on the value of the zero-field splitting parameter, the frequency dependence of the Tj values can be explained. Doddrell et al. (35) have examined the variable temperature and variable field nuclear spin-lattice relaxation times for the protons in Cu(acac)2 and Ru(acac)3. These complexes were chosen since, in the former complex, rotational reorientation appears to be the dominant time-dependent process (36) whereas in the latter complex other time-dependent effects, possibly dynamic Jahn-Teller effects, may be operative. Again current theory will account for the observed Ty values when rotational reorientation dominates the electron and nuclear spin relaxation processes but is inadequate in other situations. More recent studies (37) on the temperature dependence of Ty values of protons of metal acetylacetonate complexes have led to somewhat different conclusions. If rotational reorientation dominates the nuclear and/or electron spin relaxation processes, then a plot of ln( Ty ) against T should be linear with slope Er/R, where r is the activation energy for rotational reorientation. This was found to be the case for Cu, Cr, and Fe complexes with Er 9-2kJ mol" However, for V, Mn, and... 

Reaction of the lithium metalates 2b-e with methyl iodide or chlorosilanes in cyclohexane leads in an established manner to the neutral half-sandwich methyl- or silyl-iron complexes 4a-e which are isolated as brown or red oils, respectively, in yields between 72 and 89% (Eq. 1). 

The catalytic dimerization at 100 °C of butadiene (and isoprene) with dicarbonyldinitrosyliron and dicarbonylnitrosyl( r-allyl)iron [1—2 wt. %] to 4-vinylcyclohex-l-ene (CHs-substituted vinylcyclohexenes) can be carried out photochemically at —10 °C to 25 °C. It has been suggested, that intermediates formed by UV decomposition of the complexes may be the active catalysts, and that these intermediates could be the same as those produced thermally. u-Allyl iron tricarbonyl iodide was found to be ineffective as a thermal dimerization catalyst 90>. However, u-methallyl iron tricarbonyl bromide has been shown to be effective in the trimerization of isobutylene 284> [see section G2a],... 

Cationic alkenyl-substituted carbene complexes can also serve as precursors for the transfer of 1-alkenylcarbenes. Thus, the isolable iron complex 14 and phenylethene provide the corresponding ethenylcyclopropane derivative with moderate tram-preference, whereas its reaction with cyclooctene affords only the erafo-adduct. Workup with sodium iodide is required to release these products from their iron complexes12. 

Iridium(V) complexes, 1158 fluorides, 1158 Iridium(VI) complexes, 1158 Iron complexes acetonitrile, 1210 analysis, 1180, biological systems, 1180 coordination geometries, 1183 coordination numbers, 1182-1187 dinitrosyldicarbonyl, 1188 Mdssbauer spectroscopy, 1181 nitric oxide, 1187-1195 nitrosyls binary, 1188 bis(dithiolene), 1193 carbonyl, 1188 dithiocarbamates, 1192 halides, 1193 iodide, 1193... 

Methylbromoarsines, synthesis 26 Vanadium(III) fluoride, synthesis 27 Sulfur(IV) fluoride, synthesis 33 Peroxydisulfuryl difluoride, synthesis 34 Trichloro(tripyridine)chromium(III), synthesis 36 Tris(3-bromoacetylacetonato)chromium(III), synthesis 37 Trichloro(tripyridine)molybdenum(III), synthesis 39 Uranyl chloride 1-hydrate, synthesis 41 Rhenium(III) iodide, synthesis 50 Potassium hexachlororhenate(IV) and potassium hexa-bromorhenate(IV), synthesis 51 Iron-labeled cyclopentadienyl iron complexes, synthesis 54 Inner complexes of cobalt(III) with diethylenetriamine, synthesis 56... 

With metal halides the products isolated commonly contain coordinated halide. In the salt [Ni(pyNO)6]l2 the iodide is not coordinated but pyNO is lost at 100 °C to give [Nil2(pyNO)4], The halide is not necessarily coordinated to the same metal centre as the O-donor CoCl2 3pyNO is almost certainly [Co(pyNO)f ][CoCl4]. The iron complexes FeClj 2L, where L is pyNO, 2-picNO, 4-picNO and 2,4-lutNO, are all of the form [FeCl2L4][FeCl4]. 

The synthesis of this special type of metallo-silanol starts most efficiently with an appropriate silyl metal complex, such as Cp(OC)2Fe-SiMe2R (R = H, OMe). An anionic shift of the silyl group from the iron to the cyclopentadienyl unit can be induced with lithium diisopropylamide, leading to the metallates 21a,b. Methylation with methyl iodide produces the neutral methyl iron complexes (C5H4SiMe2R)(OC)2Fe-Me (R = H, OMe), which can be converted either, for R = H, by the Co2(CO)8 method, or, for R = OMe, by hydrolysis in the presence of acetic acid, into the corresponding silanol 22. 

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