Application of ceric ammonium nitrate

1. It is used for the determination of trace silver ions. Redox titrant. Olefin polymerization catalyst.

2. As an analytical reagent, it is often used to prepare redox titration standard solution, as a color developer for the detection of polyols by thin layer chromatography, as a raw material for the preparation of phosphate sensitive membrane electrode components, and as a reagent for the determination of various amines by potentiometric titration. It can also be used as oxidant and catalyst for olefin polymerization.

3. Ceric ammonium nitrate can is a strong oxidant with stronger oxidation under acidic conditions, second only to F2, xeo3, ag2 +, O3 and HN3. In aqueous solution and other proton solvents, can is a single electron oxidant. The consumption of can can can be judged from the change of color (from orange to light yellow). Due to the limitation of solubility in organic solvents, most of the reactions involving can are carried out in mixed solvents such as water / acetonitrile. In the presence of other oxidants such as sodium bromate, tert butyl hydrogen peroxide and oxygen, the recycling of Ce4 + can be realized, so as to realize the catalytic reaction. In addition, can is also an effective nitration reagent.

Can has oxidation activity for oxygenated compounds such as alcohols, phenols and ethers, and has specific oxidation activity for secondary alcohols. If benzyl alcohol is oxidized to corresponding aldehyde and ketone, even p-nitrobenzyl alcohol can be oxidized to p-nitrobenzyl ketone by can / O2 catalytic oxidation system. In addition, cyclic ether compounds can also be obtained for special secondary alcohols such as 4-enol or 5-enol.

Catechol, hydroquinone and their methyl ether compounds can be oxidized to quinone under the action of can. Such as the conversion of catechol to o-benzoquinone, the rapid conversion of hydroquinone to p-benzoquinone under the action of can and ultrasound, and the conversion of aryl ether to p-benzoquinone.

For the oxidation reaction of epoxy compounds, dicarbonyl compounds can also be obtained. In addition, can also has oxidative activity for carbonyl compounds with specific structures, such as the oxidation of polycyclic cage ketones to lactones.

As a single electron oxidant, can can also realize intermolecular or intramolecular carbon carbon bond formation reaction. For example, the oxidative addition reaction of 1,3-dicarbonyl compound and styrene system under the action of can (formula 7) [8], or the dimerization of aniline itself, in addition to oxidation reaction, can is also an effective nitration reagent, especially for the nitration of aromatic ring system. For example, in acetonitrile, can reacts with anisole to obtain ortho nitration products. However, due to the strong oxidation of can, the aromatic ring system often undergoes nitrification, and even produces polymers that are difficult to separate. It is found that adsorption of can on silica gel can reduce its oxidation and reduce the formation of polynitro products. For example, in acetonitrile, with silica gel as carrier, carbazole and 9-alkyl carbazole are nitrated by can, and the yield can be increased to 70% ~ 80%.