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Synthesis of halides

We have found tantalum to be especially suitable for synthetic reactions and equilibrations involving elements and their reduced halides which lie to the left of group V in the periodic table, namely the alkali metals and alkaline earth metals scandium, yttrium, and the lanthanides titanium, zirconium, hafnium, thorium, and uranium. Tantalum and niobium are also uniquely suitable containers for the syntheses of their own lowest halides, for example, Ta6Br14 3 and CsNb6In.4 Tantalum containers have been extensively employed for the synthesis of halides, but reduced compounds of some other nonmetals, some oxides, for example, perhaps can be handled as well. [Pg.16]

Another method has been described for the synthesis of halide-free ILs which uses an imidazolylidene carbene as an intermediate. The starting material is an imidazolium halide which is treated with sodium tert-butoxide to form an imidazolylidene carbene. The latter is distilled in a Kugelrohr apparatus, then reacted with a Br0nsted acid. In this way, it is possible to obtain an IL free from halide contamination, but traces of N-alkylimidazole or acid may be present. [Pg.585]

A popular reaction type in recent years has been the conversion of alcohols into other compounds by use of an organophosphorus compound in the presence of a source of a nucleophile [reaction (8)]. PhsP plus diethyl azodicarboxylate has been a particularly popular form of organophosphorus reagent, and the product is formed with inversion of configuration. In 1977 there appeared a number of variations on this general theme, for the synthesis of halides, thiocyanates, thio-ethers, azides, and esters from alcohols.Similar systems have been used to convert amides and thioamides into nitriles. ... [Pg.192]


See other pages where Synthesis of halides is mentioned: [Pg.155]    [Pg.4882]    [Pg.203]    [Pg.205]    [Pg.207]    [Pg.209]    [Pg.211]    [Pg.213]    [Pg.215]    [Pg.217]    [Pg.219]    [Pg.221]    [Pg.224]    [Pg.669]    [Pg.4881]    [Pg.408]    [Pg.45]    [Pg.71]    [Pg.996]    [Pg.164]    [Pg.22]    [Pg.271]    [Pg.271]    [Pg.272]    [Pg.273]    [Pg.273]    [Pg.274]    [Pg.275]    [Pg.276]    [Pg.277]    [Pg.278]    [Pg.279]    [Pg.280]    [Pg.203]    [Pg.207]    [Pg.209]    [Pg.211]    [Pg.213]    [Pg.215]   
See also in sourсe #XX -- [ Pg.56 , Pg.57 , Pg.58 ]




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