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493070060: ½ð±Ò+1, ¹ÄÀø½»Á÷£¬»¶Ó³£À´¾«»¯°æ£¡ 2013-08-01 14:06:26
miao19901118: ½ð±Ò+15, ¡ï¡ï¡ïºÜÓаïÖú 2013-08-01 15:07:12
493070060: ½ð±Ò+1, ¹ÄÀø½»Á÷£¬»¶Ó³£À´¾«»¯°æ£¡ 2013-08-01 14:06:26
miao19901118: ½ð±Ò+15, ¡ï¡ï¡ïºÜÓаïÖú 2013-08-01 15:07:12
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http://en.wikipedia.org/wiki/Ceric_ammonium_nitrate [CAN] The anion [Ce(NO3)6]2− is generated by dissolving Ce2O3 in hot concentrated HNO3. Ce2O3 (ŸoÉ«) + 14 HNO3 --> 2 [Ce(NO3)6]2- (³ÈºìÉ«) + 2 NO2 + 4 H3O+ + H2O Ce3+ in Ce2O3 ---> Ce4+ in [Ce(NO3)6]2- N5+ in HNO3 ---> N4+ in NO2 3O + 42O + 14H + 14 N ----> 36O + 4O + 4O + 1O + 12H + 2H + 12N + 2N Ce4+ is a stronger oxidizing agent (E¡ã ~ 1.61 V vs. N.H.E.) than even Cl2 (E¡ã ~ 1.36 V). Few shelf-stable reagents are stronger oxidants. In the redox process Ce(IV) is converted to Ce(III), a one-electron change, signaled by the fading of the solution color from orange to a pale yellow (providing that the substrate and product are not strongly colored). CAN is useful as an oxidant for many functional groups (alcohols, phenols, and ethers) as well as C¨CH bonds, especially those that are benzylic. Alkenes undergo dinitroxylation, although the outcome is solvent-dependent. Quinones are produced from catechols and hydroquinones and even nitroalkanes are oxidized. |
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