Download e-book for kindle: Analytical Chemistry of Organic Halogen Compounds by L. Mázor

By L. Mázor

ISBN-10: 0080179037

ISBN-13: 9780080179032

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Extra resources for Analytical Chemistry of Organic Halogen Compounds

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Into a slice of potassium metal (about 2 mm thick) and push the piece of potassium remaining in the tube into the bulb with a thin glass rod. In a similar way, cut out another piece of potassium but push this down only above the bulb. This will partially seal the bulb and prevent easy departure of the vapours of pyrolysis products (Fig. 2 . 1 ) . Hold the tube with tongs and slowly and carefully heat with the small flame (1 cm high) of a microburner. The potassium melts and decomposition takes place with an eventual flash.

In another group of decomposition methods, reactive metal p o w d e r s are mixed with alkali metal carbonates; for example, zinc and s o d i u m car(20) (21) b o n a t e , magnesium and potassium c a r b o n a t e , zinc and lithium carbo( 2 2) ( 2 3) nate and zinc a n d calcium o x i d e mixtures have been reported. The advantage of these methods is the relatively small a m o u n t of the decomposition reagent required; the procedure can be carried out in a capillary tube. T h u s a small volume of water is sufficient for extraction of the melt, and the detection process can be carried out in a concentrated solution.

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. Primary alkyl fluorides are resistant to nucleophilic substitution reactions.

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Analytical Chemistry of Organic Halogen Compounds by L. Mázor

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