Chlorination s. Halogenation

Chlorination s. Halogenation, Replacement of hydrogen by halogen —, catalytic 12, 599 Chlorine 12, 155 13, 402 ... 

This reaction is noteworthy for the fact that one chlorine atom of the reagent remains attached to its carbon atom usually either one or all halogen atoms are affected. The reaction sequence of the cyclization (initial S—N or C—N addition) is not established, since intermediate products have so far not been isolated. The known90 superior reactivity of the (S-halogen would suggest the primary formation of A-(trichloro-methanesulfenyl)amidine (68). 

S Halogenated Compounds Many halogenated compounds, either because of their extensive use or their persistence are of environmental interest. The smaller, halogenated aliphatics have been used extensively and are common ground water contaminants," while the persistence of the PCBs and chlorinated dibenzo dioxins is well documented. Hydroxyl radicals are the more important oxidants in the vapor phase and the hydrocarbon structure determines the nature of the reaction. Second-order rate constants for some of these compounds are summarized in Table 6.27. 

Materials/characteristic.s Some inorganic fillers. Nitrogen-donors melamine compounds. Antimony compounds with halogen donors. Halogenated containing chlorine, bromine. Halogen-free systems aluminium trihydroxide (ATH), magnesium hydroxide, zinc borate. Intumescent systems phosphorus compounds. 

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