Chlorite, oxidation with

When chlorine dioxide is obtained by anodic chlorite oxidation, with or without the addition of sulphate, it is relatively stable in the minute-to-hour time scale at room temperature in the dark. Complex formation probably stabilises the chlorine dioxide (Gordon and Emmenegger 1966). Unfortunately, observation of this complex under these conditions in water electrolysis is compromised by low optical sensitivity. 

One feature of this oxidation system is that it can selectively oxidize primary alcohols in preference to secondary alcohols, as illustrated by Entry 2 in Scheme 12.5. The reagent can also be used to oxidize primary alcohols to carboxylic acids by a subsequent oxidation with sodium chlorite.34 Entry 3 shows the selective oxidation of a primary alcohol in a carbohydrate to a carboxylic acid without affecting the secondary alcohol group. Entry 5 is a large-scale preparation that uses NaC102 in conjunction with bleach as the stoichiometric oxidant. 

Two of the complexes derived from chlorine are formed from oxides with a different valency C102 and 02 ion form a mixture of chlorite and chlorate... 

N-Methylated y-amino-p-hydroxy acids are accessible by the usual synthetic sequences, i.e. aldol condensation or y-amino-P-oxo ester reduction, starting from the corresponding N-methylated a-amino acids, but are obtained with low diastereoselectivity. 61-63 Alternatively, Brown allylboration of the ALBoc-ALMe amino aldehyde 16 (R1 = Bzl, X=Boc, Y = Me) gives the allyhc N-methylated intermediate 27 in 64% yield and 90% de (Scheme 12). 64 Oxidative cleavage of the alkenol is performed using the two-step ozonolysis and sodium chlorite oxidation sequence. 

Divalent Pd forms many planar complexes with a coordination number of 4. The tetrachlorides aie quite soluble, When a solution of palladium(II) chloride is oxidized with chlorite or chlorate ion, Pd(IV) is formed, which has a coordination number of 8, The addition of NH4Q to such a solution precipitates ammonium hexachloropalladate(IV) as a red compound. It is somewhat less stable than the platinum analog. 

As an extension to this synthetic method, Yasuda and Ley12 performed the Anelli oxidation with a polystyrene-supported nitroxyl radical and a polymer-supported chlorite (entry 8). The latter is incorporated in the reaction to oxidize the intermediate aldehydes to carboxylic acids. The choice of reagents and reaction design affords pure carboxylic acids in high yields. 

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%. 

The closing stages of Carreira s synthesis of (+ )-zaragozic acid C (Scheme 7.4) began with the Dess-Martin oxidation6 of 18. An ozon-olysis next yielded trialdehyde 19, and a buffered sodium chlorite oxidation provided the corresponding triacid. Of particular interest here was... 

The oxidation pathways of chlorine dioxide under actual conditions are complex because a number of species including chlorine, hypochlorous, chlorous, and chloric acids are formed as intermediates. A rapid conversion of chlorine dioxide to chloride and chlorite (chlorous acid, pK 2.0) may first take place, followed then by a slow phase during which mainly the chlorite reacts with the pulp components. However, continuous generation of chlorine dioxide during bleaching takes place, for example, by the reaction between chlorite and chlorine (or hypochlorous acid) ... 

Sodium chlorite in contact with sulfuric acid does not generate heat if the quantity is small. However, it can ignite from accumulated heat if the quantity is large. Table 4.7 shows contact reactions of oxidizers with combustibles other than ethylene glycol. 

SODIUM CHLORIDE see SFTOOO SODIUM CHLORIDE OXIDE see SHU500 SODIUM CHLORITE see SFT500 SODIUM CHLORITE (UN 1496) (DOT) see SFT500 SODIUM CHLORITE, solution with >5% available chlorine (UN 1908) (DOT) see SFT500 SODIUM CHLOROACETATE see SFU500 SODIUM l-(p-CHLOROBENZOYL)-5-METHOXY-2-METHYLINDOLE-3-ACETATE TRIHYDRATE see IDAIOO... 

Lindgren, B. O., Nilsson, T. Preparation of carboxylic acids from aldehydes (including hydroxylated benzaldehydes) by oxidation with chlorite. Acta Chemica Scandinavica (1947-1973) 1973, 27, 888-890. 

It is particularly noteworthy that, from the mother liquor, the resolving agent was recovered quantitatively by simple phase separation. Ease of recovery of the unwanted enantiomer 20 is another attractive feature of the approach (Fig. (6)). The compound 20 was converted back to /we5o-2-imidazolidinone dicarboxylic acid 5 in 82% yield by oxidation with inexpensive sodium chlorite (NaCbO) and re-used for the next round of the reaction. 

By examination of the spectra in Figure 5, it is clear that polysaccharides (holocellulose, peaks at 72 and 106 ppm) are dominant in the delignified humin in the upper layers of peat but diminish in relative concentration with depth. This trend was also observed in the spectra of humin in Figure 2. At depth, the polysaccharides are minor compared to the paraffinic carbons (peak at 30 ppm). Thus, the paraffinic structures in humin are resistant to sodium chlorite oxidation, and their relative increase in concentration with... 

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