Ketone

“ This method can be used in the analysis of acetone and methyl ethyl ketone in urine specimens. These compounds may be found in the urine of individuals exposed to acetone and methyl ethyl ketone [6,7] . INTERFERENCES: Acetone is a metabolite of 2-propanol; MEK is a metabolite of 2-butanol. Exposure to 2-propanol or 2-butanol may result in increased acetone or MEK excretion, respectively [8,9] . Diabetes and fasting also produce elevated urinary acetone levels [10] . Ethanol reduces MEK metabolism and thus increases the MEK concentration in urine [11] . ”

“ The first compound, containing a group COH, or more explicitly O = C—H, is an aldehyde, having a pronounced reducing power, producing silver from the oxide, and is therefore called propylaldehyde; the second compound containing the group —C·CO·C— behaves differently but just as characteristically, and is a ketone, it is therefore denominated propylketone (also acetone or dimethyl ketone) . And so, as a rule, from isomeric alcohols, those containing a group —CH2·OH, yield by oxidation aldehydes and are distinguished by the name primary ”

“ In aliphatic, as well as in aromatic, compounds, we often observe that a certain amount of residual affinity lurking in the oxygen atoms can exert a strong influence upon an entire group of atoms. One of the simplest and most reactive combinations in which oxygen may be found is that known as the carbonyl group (CO) , which, when occurring between two carbon radicals, constitutes a ketone as we have already noted. ”

“ The transition from a cellulose-ketone to the lignone-ketone involves a simple condensation without rearrangement; from which we may argue back to the greater probability of the ketonic structure of the cellulose. We must note, however, that the celluloses of the lignocelluloses are obtained as residues of various reactions, and are not homogeneous. They yield on boiling with condensing acids from 6 to 9 p.ct. furfural. It is usual to regard furfural as invariably produced from a pentose residue. But this interpretation ignores a number of other probable sources of the aldehyde. ”

“ It may be prepared by distilling diphenylene ketone over zinc dust, or by heating it with hydriodic acid and phosphorus to 150–160° C.; and also by passing the vapour of diphenyl methane through a red hot tube. It crystallizes in colourless plates, possessing a violet fluorescence, melting at 112–113° and boiling at 293–295° C. By oxidation with chromic acid in glacial acetic acid solution, it is converted into diphenylene ketone (C6H4) 2·CO ”

“ The ketone is also obtained when Bertrand’s sorbose bacterium acts on glycerol; this medium also acts on other alcohols to yield ketoses; for example: erythrite gives erythrulose, arabite arabinulose, mannitol fructose, &c.
Tetroses.-Four active tetroses are possible, and three have been obtained by Ruff and Wohl from the pentoses. Thus Wohl prepared l-threose from l-xylose and l-erythrose from l-arabinose, and Ruff obtained d- and l-erythrose from d- and l-arabonic acids, the oxidation products of d- and l-arabinoses. ”

“ The method also incorporate s the use of a n im proved solid sorbent tu be sam pler (A nasorb CM S) res ulting in improved sample recovery and allowing methyl ethyl ketone and methyl isobutyl ketone to be included in the m ethod without loss of sample recovered from the sorbent tube. Table 4 lists the method evaluation data, the LOD/LOQ values, the range of measurements, and the precisions for each analyte. ”

“ Methyl ketol, a weak organic base, obtained as a white crystalline substance having the odor of fæces.
Ke"tone (k"tn) , n. [Cf. Acetone.] (Chem.) One of a large class of organic substances resembling the aldehydes, obtained by the distillation of certain salts of organic acids and consisting of carbonyl (CO) united with two hydrocarbon radicals. In general the ketones are colorless volatile liquids having a pungent ethereal odor.
The ketones are named by adding the suffix-one to the stems of the organic acids from which they are respectively derived; thus, acetic acid gives acetone ”

“ They do not reduce silver solutions, and are not so readily oxidized as the aldehydes. On oxidation, the molecule is split at the carbonyl group and a mixture of acids is obtained. Sodium amalgam reduces them to secondary alcohols; phosphorus pentachloride replaces the carbonyl oxygen by chlorine, forming the ketone chlorides. ”

“ Liquid irritants soon came to the front—xylyl bromide and xylylene dibromide—a mixture used later under the name of T. stuff, bromo-acetone and brominated methyl ethyl ketone, later introduced under the name of B. stuff and Bn. stuff. ”

“ For example, the additive capacity of the carbonyl group in the compound methyl-ethyl ketone, CH3—CO—C2H5, is usually less than that in acetone. These and similar facts have been explained upon the hypothesis of "steric hindrance" for lack of a better phrase. Though at times this hypothesis may best explain some of the intricate problems, still it hardly dare be supposed that the paths of intra-molecular vibration of the atoms is other than large in comparison with the size of the atoms themselves ”

“ In ordinary isomers indications of mutual transformation often occur; and among these the predominant fact is that denoted as tautomerism or pseudomerism. It exhibits itself in the peculiar behaviour of some organic compounds containing the group – C·CO·C – , e.g. CH3CO·CHX·CO2C2H5, derivatives of acetoacetic ester. These compounds generally behave as ketones; but at the same time they may act as alcohols, i.e. as if containing the OH group; this leads to the formula H3C·C (OH) :CX·CO2C2H5. ”

“ The most important of the oxidation products of trop1ne is tropinone, C8H13NO, which is a ketone containing the grouping —CH2⋅⋅CO⋅CH2-since it yields a di-isonitroso derivative, a dibenzal derivative, and also forms mono- and di-oxalic esters. It is a strong base and has a powerful reducing action. ”

“ With nitrous acid (obtained from amyl nitrite and gaseous hydrochloric acid, the ketone being dissolved in acetic acid) they form isonitrosoketones, R·CO·CH:NOH (L. Claisen, Ber., 1887, 20, pp. 656, 2194) . With ammonia they yield complex condensation products; acetone forming di- and tri-acetonamines (W. Heintz, Ann. 1875, 178, p. 305; 1877, 189, p. 214) . They also condense with aldehydes, under the influence of alkalis or sodium ethylate (L. Claisen, Ann., 1883, 218, pp. 121, 129, 145; 1884, 223, p. 137; S. Kostanecki and G. Rossbach, Ber., 1896, 29, pp. 1488, 1495, 1893, &c.) . ”

“ Ketones.-Cyclo-hexanone, CGHNO, is obtained by the distillation of calcium pimelate, and by the electrolytic reduction of phenol, using an alternating current. It is a colourless liquid, possessing a peppermint odour and boiling at 155° C. Nitric acid oxidizes it to adipic acid. It condenses under the influence of sulphuric acid to form dodecahydrotriphenylene, C181-124, and a mixture of ketones (C. Mannul, Ber., 1907, 40, p. 153) . Methyl-1-cyclo-hexanone-3, CH, ~C6H, O, is prepared by the hydrolysis of pulegone. ”

“ At first lead-lined tanks were used, but later it was found that tanks [Pg 141] made of iron could be substituted. In order to take care of the small amount of hydrobromic acid, which is slowly formed, a small amount of magnesium oxide was added to the material. The amount of the oxide used was approximately in the proportion of 1 part to 1000 parts of ketone. When the magnesium oxide was used, it was found that the bromoketone kept without appreciable decomposition for about 2 months. The yield of the product from 580 kg. of acetone (10 kg.-mol. wts.) was 1,100 kg. The yield from 720 kg. ”

“ Both reactions occur to some extent simultaneously. Acetoacetic ester is a most important synthetic reagent, having been used in the production of pyridines (q.v.) , quinolines (q.v.) , pyrazolones, furfurane (q.v.) , pyrrols (q.v.) , uric acid (q.v.) , and many complex acids and ketones. ”

“ Dilute to 100 mL. NOTE: This solution is light-sensitive. Prepare immediately before using. 9. Color reagent. Mix 30 mL 0.25% DPC solution with 20 mL glacial acetic acid. 10. Methyl ethyl ketone peroxide (MEKP) , 60%, technical grade, in dimethyl phthalate. Standardize as in APPENDIX. 11. Calibration stock solution.* Pipet ca. 10 μL of 60% MEKP into a 50-mL pre-weighed volumetric flask. Accurately weigh the flask plus MEKP; dilute to the mark with dimethyl phthalate. Wrap flask in Al foil. Prepare in duplicate. 12. Sodium thiosulfate solution, 0.1 N, standardized. ”

“ The ethoxymethylene aceto-acetic esters are prepared by condensing aceto-acetic ester with ortho-formic ester in the presence of acetic anhydride (German patents 77354, 79087, 79863) . The 1.5 diketones of this type, when heated with aqueous ammonia, form pyridine derivatives. Those in which the keto groups are in combination with phenyl residues give pyridine derivatives on treatment with hydroxylamine, thus benzamarone, C6H5CH [CH (C6H5) ·CO·C6H5] , gives pentaphenylpyridine, NC5 (C6H5) 5. ”

“ This method has not been tested with aerosol generation or field samples. Special care must be taken in the conditioning of the glassware and in the storage of the samples.
INTERFERENCES: The diphenylcarbazide color reaction is relatively non-specific. Most ketones, except acetone, will exhibit positive interference at high levels. Other peroxides or any strong oxidant could also interfere with this procedure. Su bstances which catalyze the decomposition of peroxide may cause a significant decrease in the measurement ”

“ Ketones, secondary alcohols and tertiary alcohols yield a mixture of acids on oxidation. We may also notice the disruption of unsaturated acids at the double linkage into a mixture of two acids, when fused with potash.
In the preceding instances the carboxyl group has been synthesized or introduced into a molecule; we have now to consider syntheses from substances already containing carboxyl groups. Of foremost importance are the reactions termed the malonic acid and the aceto-acetic ester syntheses ”

“ Normal values of K were given by nitrogen peroxide, N2O4, sulphur chloride, S2Cl2, silicon tetrachloride, SiCl4, phosphorus chloride, PCl3, phosphoryl chloride, POCl3, nickel carbonyl, Ni (CO) 4, carbon disulphide, benzene, pyridine, ether, methyl propyl ketone; association characterized many hydroxylic compounds: for ethyl alcohol the factor of association was 2.74-2-43, for n-propyl alcohol 2.86-2.72, acetic acid 3.62-2.77, acetone 1.26, water 3.81-2.32; phenol, nitric acid, sulphuric acid, nitroethane, and propionitril, also exhibit association. ”

“ He observed that aldehydes and ketones may suffer reduction in neutral, alkaline, and sometimes acid solution to secondary and tertiary glycols, substances which he named pinacones; and also that certain pinacones when distilled with dilute sulphuric acid gave compounds, which he named pinacolines. The unsaturated acids, also received much attention, and he discovered the internal anhydrides of oxyacids, termed lactones. ”

“ DE (4 to 18 mg per sample) = 1.03; storage stability (0.7 to 4 mg per sample) = 90% after six wee ks at 25 °C; precision and a ccu racy as give n on pag e 25 00-1 (15 s am ples) [2] . A user ch eck g ave an estimated LOD of 4 :g M EK per s am ple [3] . Storage stability of MEK and m ethyl isobutyl ketone (M IBK) on An asorb CMS sam plers was determined for the Proficiency Analytic al Testing (PAT) program [1] . ”

“ The oxygenated essential oils may be either alcohols, aldehydes, ketones, acids, esters, or phenols, derived from either five-membered or six-membered closed-ring hydrocarbons. They are usually present in the plant oil in mixtures with each other or with a terpene. ”

“ Thus in the normal fatty alcohols, acids, esters, nitriles and ketones, the increment per CH2 is 19°-21°; in the aldehydes it is 26°-27°. In the aromatic compounds there is no regularity between the increments due to the introduction of methyl groups into the benzene nucleus or side chains; the normal value of 20°-21° is exhibited, however, by pyridine and its derivatives. The substitution of a hydrogen atom by the hydroxyl group generally occasions a rise in boiling-point at about 100°. The same increase accompanies the introduction of the amino group into aromatic nuclei. ”

“ For example, on reduction with zinc and alcoholic potash, the a|8 compounds give saturated ketones and also bi-molecular compounds, the By being unaffected; the B-y series react with hydroxylamine in a normal manner, the 11,8 yield oxamino-oximes. M ethyl-1-cyclo-hexene-1-one-3, CH3-C6H7O, is obtained by condensing sodium aceto-acetate with methylene iodide, the ester so formed being then hydrolysed. Isocamphorphofone, CQHHO, is trim ethyl 1-6-6.-cyclo-hexene-1-one 6. Isocamphor, CwH,6O, is methyl-1isopropyl-3-cyclo-hexene-I-one 6. ”

“ Dilute to 1.1 mL toluene to 250 mL with acetone. Stable several months. 3. Ethanol calibration stock solution (157.8 mg/mL) . Dilute 10 mL absolute ethanol to 50 mL with distilled water. Stable several months at 4 °C. 4. Citric acid. 5. Sodium citrate. 6. Dextrose. 7. Acetone. 8. Isobutanol, 8 μg/mL (aqueous) , internal standard. 9. Acidium citricum dextrose solution (ACD) . Accurately weigh 4.8 g citric acid, 13.2 g sodium citrate, and 14.7 g dextrose. Dissolve and dilute to 1 L with distilled water. 10. Blood (human) , from blood centers or from individuals not exposed to the analytes. ”

“ The aldo-ketenes are colourless compounds which are not capable of autoxidation, are polymerized by pyridine or quinoline, and are inert towards compounds containing the groupings C:N and C:O. The keto-ketenes are coloured compounds, which undergo autoxidation readily, form ketene bases on the addition of pyridine and quinoline, and yield addition compounds with substances containing the C:N and C:O groupings. The ketenes are usually obtained by the action of zinc on ethereal or ethyl acetate solutions of halogen substituted acid chlorides or bromides. ”