Cerium Azide

See other a-metal derivatives, nitrides 3966. Cerium azide... 

Caesium azide, 4262 Calcium azide, 3936 Cerium azide, 3966... 

Cerium Azide. See Cerium Triazide under Azides, Vol l,p A528-R of this Encyclopedia... 

Carbyl sulfate , see 2,4-Dithia-l,3-dioxane-2,2,4,4-tetraoxide, 0835 Ceric ammonium nitrate, Ammonium cerium(IV) nitrate, see Ammonium hexanitrocerate, 3958 Cerium azide, 3960 Cerium carbide, 0587 Cerium, 3955 Cerium dihydride, 3956 Cerium(III) tetrahydroaluminate, 0089 Cerium nitride, 3959 Cerium trihydride, 3957 Cerium trisulfide, 3961... 

Caesium azide, 4256 Calcium azide, 3930 Cerium azide, 3960... 

Carbonyl Diazide A528 L Cellulose Triacetate. See under Acetyl Celluloses A55-R Cerium Azide A528-R Cerium Hydroxydiazide A528-R Cerium Triazide A528-R Cesium Azide A528-R Cesium Carbide A72 L Chain Reaction. See under Atomic Energy A501-L... 

Using ammonium cerium(IV) nitrate (CAN) as the oxidant for the azide anion, the azido radicals are trapped by alkenes, to form, ultimately, /i-azido nitrates84 cerium azide species may be considered as intermediates. Alkenes conjugated with carbonyl groups are recovered intact. The stereochemistry of the adducts from acenaphthylene and indene was trans, as shown by H-NMR studies (/AX < 2 Hz for the acenaphthylene adduct), but with (-Eyi-phenyl-l-propene both syn and anti additions were formed. 

The precipitate from cerium nitrate and sodium azide is explosive. See other metal azides... 

Azidoalcohols (79, 81) can be accessed directly through the cerium-catalyzed addition of sodium azide onto mono-substituted epoxides. When the substituent is a simple alkyl or aryl group, nucleophilic attack at the more substituted epoxide carbon was observed i.e., 78 -> 79). However, when a phenoxy group was incorporated into the side chain (e.g., 80), a crossover to attack on the unsubstituted methylene carbon was encountered <99SC561>. 

Cerium Triazide, Ce(NsX, mw 266.20, N47.36% expl ppt obtained by Curtius Darapsky (Ref 1) by boiling a mixt of Ce nitrate and Na azide (Ref 2) No references to expl props found... 

Cement, laboratory, 1 189 Cerite, extraction of, 2 44 Cerium, phosphor containing strontium sulfide and, 3 23 separation of, from rare earth mixtures, 2 43, 47, 48 test for, 2 50 Cerium amalgam, 1 15 Cerium-group earths, separation of, from yttrium earths by doublesulfate method, 2 44, 46 Cerium (III) magnesium nitrate, 2Ce(N03)s-3Mg(N03)2-24H,0, separation of praseodymium from lanthanum by, 2 57 Cerium(III) nitrate, 2 51 Cerium (IV) nitrate, basic, 2 49 Cesium, cesium azide for preparation of, 1 79... 

Sodium aluminum chloride, 435 Sodium amalgam, 310, 416-417 Sodium amide-Sodium r-butoxide, 417-418 Sodium azide-Triphenylphosphine, 418 Sodium bis(2-methoxyethoxy)aluminum hydride, 166,418-420 Sodium borohydiidc, 323,420-421 Sodium borohydride-Alumina, 421 Sodium borohydride-Bis(2,4-pentane-dionato)copper(ll), 421 Sodium borohydride-Cerium(Ill) chloride,... 

Treatment of triisopropylsilyl enol ethers of cyclic ketones with ammonium cerium nitrate (3 equiv) and sodium azide (4.5 equiv) in acetonitrile at — 20 °C gave a-azido ketones in good yields124. By varying the ratio of the reagents the yields were lower or the formation of byproducts, difficult to separate, increased. Mixture of diastereomers (ratio not reported) were generally obtained from substituted substrates, except from the bicyclic ketones 16. 

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