Aryl azides halogenated

However, some investigators have shown that aryl azides that possess a perfluori-nated ring structure or are substituted completely with halogen atoms are quite efficient at forming the desired nitrene intermediate (Soundararajan et al., 1993 Keana... 

A useful, although somewhat limited, method of preparing vinyl azides involves the addition of azide ion to vinyl halides with subsequent elimination of halide ion. This reaction is only possible when the halogen is located to a group which can effectively stabilize the intermediate carbanion. A number of alkyl and aryl substituted )3-chlorovinyl ketones (23) have been found to react in this way ". In many cases, however, the resulting /3-azidovinyl ketones (26) cannot... 

From To — Akanes CycJoaikanes Akenes Akynes Aryls Halogen compounds Alcohols Phenols Ethers, Quinones B, 5 and Si compounds P and BI compounds Nttro. Nitroso, Azo. Azoxy, Hydrazo Azides Amines Organometahic compounds Adehydes Ketones Acids. AnHyd rides. Esters Amides, Amidines. Nitriles Hydroxy-aldehydes or -ketones. Sugars. Hydroxy acids Ammo acids. Peptides Heterocycles Nucleosides Miscellaneous, including heterocycles... 

The chemical reactivity of the thiocyano groups in these chelate rings has not been investigated, but the halogen atoms in the 3-halo metal acetylacetonates have been found to be quite inert and their behavior is different from that of aryl halides, since treatment of the tris(3-bromo-2,4-pentanediono)chromium(III) chelate with magnesium or lithium in benzene or tetrahydrofuran resulted in no reaction. Attempted nucleophilic displacement of the bromine atoms in this chelate by azide, acetate, nitrate, and iodide ions in hot dimethylformamide also failed. In most of these... 

Compounds included in this chapter are the homoleptic amides and imides of empirical formula M(NRR ) and M(NR) , where R, R = H, alkyl, aryl or trialkylsilyl, and the mixed amido-imido compounds of formula M(NRR ) (NR). Brief mention is given to certain compounds of formula L M(NRR ) or L M(NR) , where L represents a group of ligands, neutral or anionic, which also share the coordination sphere of the metal, when the chemistry of the M—N bond is of particular note. Metal-containing compounds derived from halogen azides are not discussed. 

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