Potassium periodate oxidant

The cyclohexadienone formed from carvacrol, (5-isopropyl-2-methylphenol), by potassium periodate oxidation, or with iodic acid in ethanol, has been used to synthesise 3,10-dihydroxydielmentha-5,11-diene-4,9-dione, a monoterpene dimer from the plant, Callitris macleayana (ref. 18). 

Another modification of the catalytic kinetic spectrophotometric method has been established for the determination of iodine using the principle that potassium periodate oxidize rhodamine B (RhB) to discolor and 1 has a catalytic effect on the reaction. The absorbance difference (AA) is linearly related with the concentration of iodine in the range of 0 - 2.6 pg/mL and fits the equation AA = 0.1578 C(C pg/mL) + 0.0052, with a regression coefficient of 0.9965. The detection limit of the method is 7.10 ng/mL. The method was used to determine iodine in kelp, potato, tap water, and rain water samples. The relative standard deviation of 13 replicate determinations was 1.81-2.10%. The recovery of the standard addition of the method was 96.2-99.2% (Zhaiet al., 2010). 

Potassium periodate oxidizes the Ru surface into Ru oxides, such as RUO4, Ru04, and Ru04, as shown in the reaction equations below ... 

This localization phenomenon has also been shown to be important in a case of catalysis by premicellar aggregates. In such a case [ ] premicellar aggregates of cetylpyridinium chloride (CPC) were shown to enhance tire rate of tire Fe(III) catalysed oxidation of sulphanilic acid by potassium periodate in tire presence of 1,10-phenantliroline as activator. This chemistry provides a lowering of tire detection limit for Fe(III) by seven orders of magnitude. It must also be appreciated, however, tliat such premicellar aggregates of CPC actually constitute mixed micelles of CPC and 1,10-phenantliroline tliat are smaller tlian conventional CPC micelles. 

A kinetic method for the determination of 2,4-dinitrophenol is proposed. The method is based on the inhibiting effect of 2,4-dinib ophenol on the Mn(II) catalysis of the oxidation of malachite green with potassium periodate. The reaction was followed spectrophotometrically at 615 nm. The optimal experimental conditions for the determination of 2,4-dinitrophenol were established under the optimal reaction conditions ... 

See other induction period incidents See Potassium - Slow oxidation See Dipotassium // cyclooctatetraene... 

Palladium(II) oxide, 4825 Palladium(IV) oxide, 4835 Perchloric acid, 3998 Periodic acid, 4425 Permanganic acid, 4434 Peroxodisulfuric acid, 4482 Peroxodisulfuryl difluoride, 4328 Peroxomonosulfuric acid, 4481 Peroxytrifluoroacetic acid, 0666 Platinum hexafluoride, 4371 Platinum(IV) oxide, 4836 Plutonium hexafluoride, 4372 Potassium bromate, 0255 Potassium chlorate, 4017 Potassium dichromate, 4248 Potassium iodate, 4619 Potassium nitrate, 4650 Potassium nitrite, 4649 Potassium perchlorate, 4018 Potassium periodate, 4620 Potassium permanganate, 4647 Rhenium hexafluoride, 4373 Rubidium fluoroxysulfate, 4309 Ruthenium(VIII) oxide, 4862 Selenium dioxide, 4838 Selenium dioxide, 4838 Silver permanganate, 0021 Sodium chlorate, 4039 Sodium chlorite, 4038 Sodium dichromate, 4250 Sodium iodate, 4624 Sodium nitrate, 4721 Sodium nitrite, 4720... 

The position and geometry of the side chain double bonds can be determined by ozonolysis and a potassium permanganate-sodium periodate oxidation, as well as by the IR spectrum. Results have shown that the side chain double bonds are always Z 16,122,126). 

Potassium periodate is a powerful oxidizing agent in acid. It is, therefore, used as an oxidizing agent in organic synthesis and in titrimetric and colorimetric analysis based on its oxidation-reduction reactions. 

Potassium periodate can be prepared by oxidation of potassium iodate with a powerful oxidizing agent such as potassium permanganate, chlorine or bromine in basic solution ... 

Bicyclo[5.2.0]nonane-l,7-diol was oxidized by potassium periodate in water at room temperature to yield cyclononane-1,4-dione (6). 56... 

Furo[3,2-c][l]benzopyran-4-ones have been prepared either by acid catalyzed condensation of 4-hydroxycoumarin with a benzoin derivative (equation 11) (81IJC(B)614) or from 3-allyl-4-hydroxycoumarins on oxidation with osmium tetroxide/potassium periodate followed by cyclization of the intermediary aldehyde with PPA (equation 12) (79G109). 

Sodium periodate, and less frequently potassium periodate, are employed in oxidations which are to be carried out within the pH range 3-5. Sodium metaperiodate (NaI04) has a solubility in water of c. 0.07 g per ml the addition of alkali leads to the precipitation of the far less soluble sodium paraperiodate (Na2H3I06, disodium trihydrogen orthoperiodate, water solubility c. 0.20%). Sodium paraperiodate is available commercially and may be converted into the... 

Palladium(II) oxide, 4819 Palladium(IV) oxide, 4829 Perchloric acid, 3992 Periodic acid, 4419 Permanganic acid, 4428 Peroxodisulfuric acid, 4476 Peroxodisulfuryl difluoride, 4322 Peroxomonosulfuric acid, 4475 Peroxytrifluoroacetic acid, 0662 Platinum hexafluoride, 4365 Platinum(IV) oxide, 4830 Plutonium hexafluoride, 4366 Potassium bromate, 0255 Potassium chlorate, 4011 Potassium dichromate, 4242 Potassium iodate, 4614 Potassium nitrate, 4645 Potassium nitrite, 4644 Potassium perchlorate, 4012 Potassium periodate, 4615 Potassium permanganate, 4642 Rhenium hexafluoride, 4367 Rubidium fluoroxysulfate, 4303 Ruthenium(VIII) oxide, 4856 Selenium dioxide, 4832 Selenium dioxide, 4832 Silver permanganate, 0021... 

Following the periodate oxidation, the 2,3-dialdehyde celluloses were either reduced with potassium borohydride to form the dialcohol or oxidized with sodium chlorite to give dicarboxyl celluloses. The strength loss of the former products was kept lower than 27% and that of the latter 37%. 

Buchanan, Dekker and Long used periodate oxidation, followed either by Schiff s reagent (for cis-diols) or potassium iodide (for triols). The test is general for non-reducing carbohydrates having the necessary configuration of hydroxyls. Lead tetraacetate oxidation requires no further reagent to reveal the spot.66... 

An aqueous solution of sulfuric acid and a salt of periodic add, trisodium paraperiodate, or one of the potassium periodates, has been used frequently as a substitute for pure periodic add. When the product of the oxidation reaction is to be isolated, the effect of the presence of metal ions on the yield should be considered. If the product is volatile or slightly soluble, or is isolated either as a slightly soluble derivative or by extraction with organic solvents, the presence of metal ions should not reduce the yield. In the Case of certain methylhexosides34 which were oxidized by periodic acid formed from potassium metaperiodate and an equivalent of sulfuric add in aqueous solution, the presence of potassium ions was found to cause a low yield of the crystalline strontium salt prepared by the strontium hypobromite oxidation of the dialdehyde resulting from the periodic add reaction. Oxidation by pure periodic add, a solution of which is prepared either from crystalline paraperiodic add or by the previously mentioned method from potassium metaperiodate, is desirable when the presence of difficultly removed metal ions affects the yield adversely. 

Oxidation of 9,10-Dihydroxystearic Acid.116 The Use of Aqueous Ethanol as the Solvent. A solution of 6 g. of potassium periodate in 300 cc. of N sulfuric add at 20° is added rapidly to a solution of 8 g. of 9,10-dihydroxystearic add (m.p. 132°) in 400 cc. of alcohol at 40°. After ten minutes the clear solution is cooled to 15° and diluted with suffident water to dissolve the predpitated potassium sulfate. Extraction with ether gives an oily product, which is submitted to steam distillation. Extraction of the distillate with ether yields 3.2 g., or 89%, of pure pelargonaldehyde as a colorless oil boiling at 76-77° (11 mm.). 

Potassium periodate - tetrabase test A solution of the tetrabase (tetra-methyl-diamono-diphenylmethane) in chloroform is employed as a sensitive test to identify very small amounts of manganese as permanganic acid. The latter oxidizes the tetrabase to an intensely blue compound. Chromium salts should be absent for they are oxidized by periodates to chromates, which yield a similar colour with the tetrabase . 

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