Ketone stearic acids

Stearic acid (octadecanoic acid). [57-11-4] M 284.5, m 71.4°. Crystd from acetone, acetonitrile, EtOH (5 times), aq MeOH, ethyl methyl ketone or pet ether (b 60-90°), or by fractional pptn by dissolving in hot 95% EtOH and pouring into distd water, with stirring. The ppte, after washing with distd water, was dried under vacuum over P2O5. It has also been purified by zone melting. [Tamai et al. JPC 91 541 1987]. 

Waxy ketones Synthetic esters Fatty acid amides Amide derivatives Imide condensation products Fatty alcohols Fatty acidis Metal soaps Palmitone cetyl stearate palmitamide stearanilide N-hexadecyl phthalimide stearyl alcohol stearic acid 12 hydroxstearic acid calcium resinate barium resinate calcium stearate barium stearate ... 

Recovery of Other Solutes on Standard Parfait Columns. The porous Teflon bed gave the most reproducible recoveries of test solutes. Table VI identifies the solutes found exclusively on Teflon and shows their recoveries. The influence of increasing the Teflon bed volume from 50 to 150 mL was mentioned earlier. From column 106, it is evident that BHT and stearic acid were the two most strongly adsorbed solutes. The least well-recovered solutes in this group were 1-chloro-dodecane and methyl isobutyl ketone however, both of these solutes are so readily volatilized that losses during concentration of eluates must be considered a likely source of their low recovery. 

Fatty acids, stearic acid, ketone bodies... 

An aliphatic ketone (9-heptadecanone) and two keto derivatives of stearic acid (as potassium salts) containing a ketone functionality either at position 5 or 12 were incorporated into bilayers of the phospholipid l,2-dihexadecyl-sn-glycero-3-phosphocholine. Infrared spectra of these mixtures were measured as a function of temperature and amount of added cholesterol. It was found that the presence of cholesterol in these bilayers induces changes in the location of the guest ketone and that these changes are dependent on both temperature and cholesterol concentration. It is also demonstrated that, in the gel phase, the presence of cholesterol induces larger intersheadgroup separations and, therefore, water penetrates deeper into the lipid bilayer. 

In 1973, Van Dorp et al. found a number of interesting macro-cyclic compounds, including some with both double and triple unsaturated bonds (26), but made no attempt to determine their biological significance. They compared the macrocyclic ketones and the fatty acids found in civet and muskrat gland and concluded that there is evidently no correlation between the macrocyclic ketone composition and the fatty acid composition. For example, cycloheptadecanone was the most prominent peak in the muskrat gland (41% of the macrocyclic ketones), whereas the stearic acid from which it could have been formed, was among the minor components (3%) of the fatty acids. 

Propa, Propanoic acid Buta, butanoic acid Penta, pentanoic acid Hexa, hexanoic acid Hepta, heptanoic acid Octa, octanoic acid Nona, nonanoic acid Deca, decanoic acid Pal, palmitic acid St, stearic acid Piva, trimethylacetic acid Vers, Versatic acid a-BrHexa, a-bromohexanoic acid x-BrSt, a-bromostearic acid Me2(OH)Hexa, 2,5-dimethyl-2-hydroxyhexanoic acid a,a -DAC, a,a -dialkylcarboxylic acid Naph, naphthenic acid cy-PA, cyclopentylacetic acid cy-Hexa, cyclohexanecarhoxylic acid C7-C mix, C7-C9 mixture CB, chlorobenzene cy-Hexn, cyclohexane 1,2-DCE, 1,2-dichloro-ethane (i-Pr)2CO, diisopropyl ketone i-amOAc, isoamyl acetate i-amOH, isoamyl alcohol MIBK, 4-methyl-2-pentanone NB, nitrobenzene n-Hexn, n-hexane PE, petroleum ether TCB, 1,2,4-trichlorobenzene. 

The thermal decarboxylation of a mixture of barium salts has been used to prepare unsymmetrical ketones the yields are not stated. The earlier procedure has been modified by carrying out the reaction in vacuo in an iron flask. Glass reaction vessels are inferior. In this manner, a large number of the high-molecular-weight methyl ketone s, C9, C,o, C,j-C , and C, are prepared in 54-67% yields. Cyclopentanone has been synthesized in 80% yield by distillation of adipic acid from barium hydroxide at 295°. In a study of metallic oxides and carbonates, magnesium oxide is preferred for the liquid-phase ketonization of stearic acid at 330-360° (95%). A convenient method for the preparation of dibenzyl ketone is the reaction of phenylacetic acid, acetic anhydride. 

Four reactions are involved in oxidizing the p-carbon to a ketone. We will use the fatty acyl CoA formed from one 18-carbon acid, stearic acid, as an example of the reactions. We will also keep track of any NADH or FADH2 produced in the reactions because these molecules can enter the respiration process (electron transport chain). The reactions involved in p-oxidation are shown in I Figure 14.5. 

Constituent of Pdlyporua offkindlia, Vill, Leaflets + l HgO from EtOH.Aq. Anhyd. at 100. M.p. 142° decomp. Spar. sol. EtOH, EtgO. [a]i - 8-84° in NaOH. Ale. KOH at 160° —stearic acid. HgSOg —methyl heptadecyl ketone. 

Proton exchange membranes (PEM) were also prepared by solution blending of sulfonated poly(phthalazinone ether ketone) (sPPEK) and various amotmts of sulfonated silica nanoparticles (silica-SOsH) [58]. The solution blending techiuque was also used in combination with compression molding thus, poly(ether ether ketone) (PEEK)-based nanohybrids were fabricated by means of compression molding at 400°C under a pressure of 60 MPa using silica surface-modified with stearic acid and PEEK [59]. 

Methyl ethyl ketone Mineral oils Oleic acids Oleic compounds Pnosphate salts Phosphoric acid Potassium hydroxide Pulp mill liquors Sodium hydroxide Stearic acid Sulfate salts Sulfuric acid Tall oil Toluene... 

---