Ceric chloride

Ceri. ceric, cerium(IV). -chlorid, n. ceric chloride, cerium(IV) chloride. 

Ceric chloride, CeCl4, ie known only in solution. It is prepared by dissolving ceric hydroxide in concentrated HC1, but the evolution of chlorine begins at once and proceeds rapidly if the solution is hot It forms double chlorides with organic bases, such as pyridine, quinoline, and triethylamine. 

Various C-seco analogs have been prepared in addition to 4.2.2.6 described above. Thus treatment of 10-deacetylbaccatin III with cupric acetate gave the 10-oxo derivative as described previously 42), and treatment of this compound with sodium borohydride and ceric chloride gave a mixture of the lO-e/ /-10-deacetylbaccatin III and the D-seco product 4.2.2.9 182). In a later publication the taxol analogs 4.2.2.10-4.2.2.13 were prepared by standard methods from 4.2.2.9 183). 

Very recently, Varalashmi et al. prepared a new class of diethyl(3,5-di-bromo-4-hydro3g henylamino)(substituted phenyl/heterocyclic)methylphos-phonates (52) by one-pot three-component Kabachnik-Fields reactions of 4-amino-2,6-dibromophenol (51), substituted heterocyclic/phenyl aldehydes (44) and diethylphosphite (2) using hydrated ceric chloride (5 mol%) under microwave irradiation in THF (Scheme 24). The reaction is rapid and highly efficient Moreover, the investigators evaluated in vitro... 

Qualitative. The classic method for the quaUtative determination of silver ia solution is precipitation as silver chloride with dilute nitric acid and chloride ion. The silver chloride can be differentiated from lead or mercurous chlorides, which also may precipitate, by the fact that lead chloride is soluble ia hot water but not ia ammonium hydroxide, whereas mercurous chloride turns black ia ammonium hydroxide. Silver chloride dissolves ia ammonium hydroxide because of the formation of soluble silver—ammonia complexes. A number of selective spot tests (24) iaclude reactions with /)-dimethy1amino-henz1idenerhodanine, ceric ammonium nitrate, or bromopyrogaHol red [16574-43-9]. Silver is detected by x-ray fluorescence and arc-emission spectrometry. Two sensitive arc-emission lines for silver occur at 328.1 and 338.3 nm. 

Bromide ndIodide. The spectrophotometric determination of trace bromide concentration is based on the bromide catalysis of iodine oxidation to iodate by permanganate in acidic solution. Iodide can also be measured spectrophotometricaHy by selective oxidation to iodine by potassium peroxymonosulfate (KHSO ). The iodine reacts with colorless leucocrystal violet to produce the highly colored leucocrystal violet dye. Greater than 200 mg/L of chloride interferes with the color development. Trace concentrations of iodide are determined by its abiUty to cataly2e ceric ion reduction by arsenous acid. The reduction reaction is stopped at a specific time by the addition of ferrous ammonium sulfate. The ferrous ion is oxidi2ed to ferric ion, which then reacts with thiocyanate to produce a deep red complex. 

Dimethoxybenzyl esters prepared from the acid chloride and the benzyl alcohol are readily cleaved oxidatively by DDQ (CH2CI2, H2O, rt, 18 h, 90-95% yield). A 4-methoxybenzyl ester was found not to be cleaved by DDQ. The authors have also explored the oxidative cleavage (ceric ammonium nitrate, CH3CN, H2O, 0°, 4 h, 65-97% yield) of a variety of 4-hydroxy- and 4-amino-substituted phenolic esters. ... 

Alkaloid B. This was isolated as the chloride, C20H25ON2CI, which in 2N-sulphuric acid gives a deep, reddish-violet colour with either potassium dichromate or ceric sulphate. The picrate has m.p. 195-6°. 

C-Alkaloid X obtained in minute quantity as a crystalline chloride, which with nitric acid gives an intense red colour with a violet fluorescence, and orange slowly becoming red, with ceric sulphate in sulphuric acid. 

Ceric ammonium nitrate, CH3CN, H2O, 0°, 95% yield. In the presence of chloride ion, cleavage fails." ... 

Carboxylic acids, a-bromination of 55, 31 CARBOXYLIC ACID CHLORIDES, ketones from, 55, 122 CARBYLAMINE REACTION, 55, 96 Ceric ammonium nitrate [Ammonium hexa mtrocerate(IV)[, 55, 43 Chlorine, 55, 33, 35, 63 CHROMIUM TRIOXIDE-PYRIDINE COMPLEX, preparation in situ, 55, 84 Cinnamomtnle, a-phenyl- [2-Propeneni-tnle 2,3-diphenyl-], 55, 92 Copper(l) iodide, 55, 105, 123, 124 Copper thiophenoxide [Benzenethiol, copper(I) salt], 55, 123 CYCLIZATION, free radical, 55, 57 CYCLOBUTADIENE, 55, 43 Cyclobutadieneiron tricarbonyl [Iron, tn-carbonyl(r)4-l,3-cyclo-butadiene)-], 55,43... 

The diester 110 (E = CC Et) reacts with a mixture of trimethyltin chloride and sodium cyanoborohydride under AIBN catalysis to give the cyclopentane 111 as a 4 1 mixture of cis- and fraws-isomers. The products are destannylated to the acetals 112 by treatment with methanolic ceric ammonium nitrate (CAN). The 1,7-octadienyl derivative 113 was similarly converted into the cyclohexanes 114 (cis/trans = 1 1) (equation 60)67. 

Guthrie, F. K. Bonding in ceric-ion intiated graft polymers of polyvinyl chloride on cellulose. Tappi 46, 656 (1963). 

In fine chemical manufacturing, the application of promoted platinum catalysts is less known. Maxted and Akhar have reported that the addition of stannous, manganous, ceric and ferric chloride to platinum oxide (Adams catalyst) facilitates the hydrogenation of aldehydes, ketones and olefins (ref. 1). The selective hydrogenation of unsaturated aldehydes or ketones to unsaturated alcohols has been achieved by the addition of ferrous sulfate and zinc acetate to platinum catalysts (ref. 2). 

Ceric ammonium nitrate Cerate(2-), hexanitrato-, diammonium Cerate(2-), hexakis(nitrato-O)-, diammonium, (OC-6-11) (16774-21-3), 67,141 Cerium(ill) chloride, heptahydrate (18618-55-8), 69, 89 Cesium carbonate Carbonic acid, dicesium salt (534-17-8), 65, 150 CESIUM THIOLATES, 65, 150 Chiral auxiliary, 65, 173, 183, 203, 215 Chiral oxazolidinone auxiliary, from phenylalanine, 68, 77, 83 Chirasil-Val, 66, 153, 154... 

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