Abstract
1. Thermal decomposition of non-solvated organomagnesium compounds leads to the production of ethylenic hydrocarbons but not free radicals. 2. Interaction between non-solvated alkylmagnesium halides and alkyl halides leads to the formation of free radicals from both the organomagnesium compound and alkyl halide. 3. There is a distinct similarity between reaction mechanisms in RM ÷ R'X systems and in M ÷ RX systems. 4. The choice between heterolytic and free-radical reactions in RMgX ÷ R'X systems is essentially dependent on the complexing capacity of the media. The heterolytic Wurtz and exchange reactions are favoured in strongly solvating solvents; the predominant formation of free radicals takes place in unsolvating solvents.
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