Propene hydrogen bromide added

Detailed studies of systems involving aluminium-based Lewis acids and hydrogen halides are scarce. Fontana and Kidder investigated the polymerisation of propene initiated by the pair aluminium bromideTiydrt n bromide. The cocatalytic role of the latter acid was clearly proved since no polymerisation could be detected in its absence. The dependence of the rate of polymerisation upon the cocatalyst concentration and the induction periods observed make this system similar to those in which stannic chloride induces the polymerisation of olefins in the presence of variable quantities of water (see Sect. IV-C-3-b). With relatively large quantities of added hydrogen bromide, addition of this acid to the mcmomer to give fso-propyl bromide must have constituted an important side reaction. 

Earlier we looked at the formation of 2-bromopropane when hydrogen bromide was added to propene, and also the formation of ethanol from ethene reacting with dilute sulphuric acid. Suggest what would be the product of the reaction between propene and dilute sulphuric acid. 

Hydrogen halides form alkyl halides by addition to the double bonds of alkenes. For example, hydrogen bromide HBr, can be readily added to propene in the reaction in which hydrogen binds to the carbon atom of the CH2 group. The resulting product is 2-bromopropane. If HBr is added to 2-methylbut-2-ene the hydrogen binds to the... 

The reaction is faster with electron-rich alkenes. The rate constants for addition of bromine to a series of alkenes were found to increase in the order ethene < propene < 2-butene isobutene < 2-methyl-2-butene. In other words, each methyl group that replaces a hydrogen atom on ethene increases reactivity. The addition of bromine to substituted ethenes in methanol with added sodium bromide can be correlated to the equation... 

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