So, a gem-diol cannot form, and the aldehyde is not further oxidized. Y. Obora, Y. Ishii, in Comprehensive Organic Synthesis II (Second Edition), 2014, Chromic acid combined with sulfuric acid in water, which is referred to as the Jones reagent, has been widely used as a convenient oxidizing reagent of ethers.3 Oxidation of 6-hydroxy-2-(4-methoxyphenyl)-2-methyl-2H-pyran-3(6H)-ones with the Jones reagent affords diones (equation 1), which are intermediates in the synthesis of substituted pyrrolidinones and oxaspiro derivatives.4,5, PCC is a good oxidant in allylic oxidation of activated methylene compounds. An increase in the concentration of competing sulfate ions yields only a negligible decrease in chromate capacity. In the second step, the chromic ester undergoes an α-elimination reaction. The centrally located cathode can be pulled easily for cleaning. Table 10. The crystalline product is collected by filtration and recrystallized from aqueous methanol. As in many other electrolytic applications, contact of the membrane with the cathode should be avoided. Table 16. A primary alcohol is oxidized to an aldehyde or all the way to a carboxylic acid, while a secondary alcohol to a ketone. The Jones oxidation also uses acetone as a co-solvent in the reaction to prevent over-oxidation of the organic product. Zirconium is also resistant to certain mixed acids that include sulfuric–nitric, sulfuric–hydrochloric, and phosphoric–nitric mixtures. Which of the isomeric C4H10 alcohols reacts with the Jones reagent to produce the ketone C4H8O? Zirconium resists chromic acid up to 30% at temperatures to 100 °C71 but it is not suitable for handling certain chrome-plating solutions that contain fluoride catalysts. Chromic acid used in surface etching of plastic parts prior to metallizing. The Jones oxidation is an organic reaction used to oxidize alcohols using chromic trioxide and acid in water. Consequently, fixed-bed experiments using standard acidic chromate-bearing waste waters exhibit a gradual increase in the effluent concentration. The addition is continued until the orange color of the reagent persists for about 20 minutes. A solution of 15.6 g (0.1 mole) of 4-t-butylcyclohexanol in 250 ml of acetone is placed in a 500-ml three-necked flask fitted with a dropping funnel, a thermometer, and a mechanical stirrer. Above pH 6.5 mostly CrO42− is found. In the acidic region (1.

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