Cobalt oleate

Other Cobalt Compounds. Catalysts prepared from cobalt oleate, octoate, and acetyl acetonate have also been examined. The characteristics of the reactions were the same as with cobalt chloride and naphthenate. The results are shown in Table X. 

Figure 7.13 TEM image of self-assembled CoO nanorods, prepared by decomposition of cobalt oleate (size 9 nm x 46 nm) observed after the slow evaporation of a hexane solution of nanorods. (Reprinted with permission from K. An et al. J. Am. Chem. Soc. 2006, 128, 9753. Copyright (2006) American Chemical Society.)...

Cobaltous nitrate. See Cobalt nitrate (ous) Cobaltous octoate. See Cobalt octoate Cobaltous oleate. See Cobalt oleate (ous) Cobaltous oxide. See Cobalt oxide (ous) Cobaltous perchlorate Cobaltous perchlorate hexahydrate. See Cobalt perchlorate (ous) Cobaltous phosphate. See Cobalt phosphate (ous)... 

Cobalt diacetate Cobalt hydroxide (ous) Cobalt naphthenate (ous) Cobalt oleate (ous) Cobalt resinate (ous)... 

Magnetic semiconducting materials have also been explored cobalt phosphide (C02P) nanowires have been synthesised by a one-pot colloidal reaction of cobalt oleate in TOP at 290 or 320 °C [Fig. 14(a),(b)]. Initially, cobalt (II) carbonate reaeted with oleic acid at 80 °C in TOP to form cobalt (II) oleate which was further heated up to obtain cobalt phosphide nanostructures. When OAm was added to the reaction pot at 290 or 320 °C, C02P or CoP nanorods were formed respectively [Fig. 14(c),(d)]. The erystallite size of the nanowires (5.6 and 6.6 nm) and nanorods (8.7 and 14 nm) increased with reaction temperature according to XRD analysis. Ternary cobalt iron phosphide nanostructures were synthesised by the reaction of iron (III) oleate and cobalt (II) oleate with TOP in the presence of OAm. Coi.sFeo.sP nanorice was obtained at 290 °C, whereas C01.7Feo.3P parallel/ perpendicular split nanostructures was formed at 320 °C [Fig. 14(e),(f)]. 

Metals. Transition-metal ions, such as iron, copper, manganese, and cobalt, when present even in small amounts, cataly2e mbber oxidative reactions by affecting the breakdown of peroxides in such a way as to accelerate further attack by oxygen (36). Natural mbber vulcani2ates are especially affected. Therefore, these metals and their salts, such as oleates and stearates, soluble in mbber should be avoided. 

Cobalt(II) acetylacetonate [14024-48-7] cobalt(II) ethyUiexanoate [136-52-7] cobalt(II) oleate [14666-94-5] cobalt(II) linoleate [14666-96-7] cobalt(II) formate [6424-20-0], and cobalt(II) resinate can be produced by metathesis reaction of cobalt salt solutions and the sodium salt of the organic acid, by oxidation of cobalt metal in the presence of the acid, and by neutralization of the acid using cobalt carbonate or cobalt hydroxide. 

Homogeneous Oxidation Catalysts. Cobalt(II) carboxylates, such as the oleate, acetate, and naphthenate, are used in the Hquid-phase oxidations of -xylene to terephthaUc acid, cyclohexane to adipic acid, acetaldehyde (qv) to acetic acid, and cumene (qv) to cumene hydroperoxide. These reactions each involve a free-radical mechanism that for the cyclohexane oxidation can be written as... 

Cobalt in Driers for Paints, Inks, and Varnishes. The cobalt soaps, eg, the oleate, naphthenate, resinate, Hnoleate, ethyUiexanoate, synthetic tertiary neodecanoate, and tall oils, are used to accelerate the natural drying process of unsaturated oils such as linseed oil and soybean oil. These oils are esters of unsaturated fatty acids and contain acids such as oleic, linoleic, and eleostearic. On exposure to air for several days a film of the acids convert from Hquid to soHd form by oxidative polymeri2ation. The incorporation of oil-soluble cobalt salts effects this drying process in hours instead of days. Soaps of manganese, lead, cerium, and vanadium are also used as driers, but none are as effective as cobalt (see Drying). 

Hiraide et al. [737] developed a multielement preconcentration technique for chromium (III), manganese (II), cobalt, nickel, copper (II), cadmium, and lead in artificial seawater using coprecipitation and flotation with indium hydroxide followed by ICP-AES. The metals are simultaneously coprecipitated with indium hydroxide adjusted to pH 9.5, with sodium hydroxide, ethano-lic solutions of sodium oleate and dodecyl sulfate added, and then floated to... 

Oxidation of Cyclohexane. The synthesis of cyclohexanol and cyclohexanone is the first step in the transformation of cyclohexane to adipic acid, an important compound in the manufacture of fibers and plastics. Cyclohexane is oxidized industrially by air in the liquid phase to a mixture of cyclohexanol and cyclohexanone.866 872-877 Cobalt salts (naphthenate, oleate, stearate) produce mainly cyclohexanone at about 100°C and 10 atm. The conversion is limited to about 10% to avoid further oxidation by controlling the oxygen content of the reaction mixture. Combined yields of cyclohexanol and cyclohexanone are about 60-70%. 

In the case of rhodium as a catalyst metal for the hydroformylation of methyl oleate, lower pressure and lower temperature have to be compared to cobalt catalysis [20, 21], The use of rhodium is also advantageous because of the lower isomerization. Frankel showed that with a rhodium triphenylphosphine catalyst, hydroformylation occurs only on the ninth and tenth carbon atoms of the methyl oleate [22]. 

The first preparation of dicobalt octacarbonyl was made by reacting freshly reduced cobalt metal with 100 atm. of carbon monoxide at 200° (Mond, Hirtz, and Cowap, 25). No solvent was used in this preparation. Raney cobalt in an ether suspension has been recommended (Adkins and Kresk, 15). Treatment of the mixture with 200 atm. of carbon monoxide at 150° for 5 to 6 hours gave a dark red ether solution containing the dicobalt octacarbonyl. The simplest method of preparation consists of the treatment of a cobalt salt in benzene solution with synthesis gas. Cobalt acetate, carbonate, oleate, naphthoate, and octoate have been employed extensively. In a typical preparation (Wender, Greenfield, and Orchin, 18) a slurry of 15 g. cobalt(II)carbonate in 100 ml. of benzene is treated with synthesis gas at 250 atm. pressure in a 500 ml. autoclave at 130-160° for 1 hour. The clear dark benzene solution contains about 0.016 g. dicobalt octacarbonyl per milliliter. 

Precipitation of the catalyst from the reaction medium, followed by filtration, as in the cobalt-based hydroformylation process (see Section 5.4). Here cobalt is removed from the reaction products in the form of one of its salts or as the sodium salt of the active carbonyl catalyst. The aqueous salts can be recycled directly, but sometimes they are first converted into an oil-soluble long-chain carboxylic acid salt, such as the corresponding naphthenate, oleate, or 2-ethylhexanoate. 

Amyl Phenol 136-52-7 Cobalt Octoate 142-77-8 Butyl Oleate... 

Derivation By heating cobaltous chloride and sodium oleate followed by filtration and drying. 

The first investigations concerning the hydroformylation of fatty compounds were accomplished by Ucciani and co-workers with cobalt catalysts such as cobalt bislaurate and dicobalt octacarbonyl [29]. Later, Frankel and co-workers found that the cobalt-catalyzed hydroformylation of methyl oleate also leads to the corresponding fatty alcohols [30]. In recent investigations on the hydroformylation of fatty compounds, the preferred catalyst is based on rhodium. For instance, the hydroformylation of methyl oleate catalyzed by [Rh(acac)(CO)2]/biphephos yields an isomeric mixture of formylstearic add methyl esters [31]. 

In mineral-reagent systems, surface precipitation has been proposed as another mechanism for chemisorption. The solubility product for precipitation and the activities of the species at the solid-liquid interface determine the surface precipitation process. Under appropriate electrochemical conditions, the activity of certain species can be higher in the interfacial region than that in the bulk solution and such a redistribution can lead to many reactions. For example, the sharp increase in adsorption of the calcium species on silica around pH 11 has been shown to be due to surface precipitation (Somasundaran and Anan-thapadmanabhan, 1985 Xiao, 1990). Similar correlations have been obtained for cobalt-silica, alumina-dodecylsulfonate, calcite/apatite/dolomite-fatty acid, francolite-oleate and tenorite-salicylaldoxime systems. The chemical state of the surfactant in the solution can also affect adsorption (Somasundaran and Ananthapadmanabhan, 1985). 

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