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Extra resources for Analytical Chemistry of Organic Halogen Compounds
Extract the mass with a droplet of hot water and use the clear alkaline extract for testing for halogens. 3. Decomposition with silver γ FIG. 3. Körbl decomposition. 7, Sample; 2, asbestos plugs permanganate (24) In the method of K ö r b l , strong oxidative action is produced by means of silver permanganate a n d its thermal decomposition products. 4 g). After dissolution allow the solution to cool until crystallization of silver permanganate is complete. Filter this onto a sintered glass filter, wash with cold water (150 ml), dissolve in hot water (400 ml) and filter the hot solution through a sintered glass filter.
The reactivity of organic fluoro compounds is usually lower than that of other organic halogen compounds. The C—F bond energy is more than twice that of the C - I bond, a n d exceeds the C - C l b o n d energy. The C - F b o n d is shorter t h a n the corresponding b o n d in other halogen derivatives, which results in increased stability of the b o n d to external attack. Almost n o rule of general validity can be given for the reactivity of fluoro compounds, since it strongly depends on the relative position of two or more fluorine atoms in aliphatic compounds and on the nature of the other substituents attached to the ring in aromatic compounds.
Hal'© - YH + ^ C = C ( ^ + Hal© Negatively charged or neutral species can act as Y. In the ΕχθΒ mechanisms the proton leaves the molecule before the halogen, with the formation of an intermediate a n i o n : 1. Y© + H - C - C - H a l I I I I slow \ 2. © C - C - H a l — > ) C = C ( κ I I ©C-C-Hal I I / + Hal© x Reactions proceeding by a radical mechanism will be discussed in connection with thermal dehalogenation of organic halogen compounds. 46 ANALYTICAL CHEMISTRY OF ORGANIC HALOGEN COMPOUNDS 4.