Aliphatic chloro-compounds determination

Kester [5] has discussed the application of the purge and trap gas chromatographic method to the determination of aliphatic chloro-compounds in soil. Following methanol extraction of the soil the extract is gas purged and the purge gases trapped on a Tenax silica gel/ charcoal trap followed by thermal desorption from the trap and examination by gas chromatography and mass spectrometry. Compounds that have been determined by this method are listed in Table 5.1. 

The polyketones are produced [356] by the reaction of 2,7-dibenzyli-denecyclopentanone (I) and dibenzylideneacetone (II) with dichlorides of different acids (isophthalic, 3,3 -azodibenzoic and others) in dry chloro-methane in the presence of AICI3. The model compounds from I and II and benzoylchloride are also obtained. The synthesized polyketones have intrinsic viscosity 0.36-0.84 deciliter/gram (25 °C, H2SO4). They do not dissolve in most organic solvents, dissipate in H SO. It is determined that the polyketones containing the aromatic links are more stable than those involving aliphatic and azo group. The temperature of 10% and 50% mass loss is 150-250 °C and 270-540 °C for these polyketones. 

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