Answer to Question #16775 in Organic Chemistry for kenneth mcdonald

Question #16775
How AND UNDER WHAT CONDITIONS DOES SULPHURIC ACID REACT WITH BENZENE AND ETHYLENE? Give equation , the condition s under which benzene can be converted to styrene and acetophenone. H=1 ;C= 12.
Expert's answer
H2SO4 + C6H6 <=> C6H5-SO3H + H2O heat.catalyst.

Similarly, fuming sulphuric acid absorbs ethylene at room temperature to form ethyl
hydrogen sulphate, with much evolution of heat.

H2SO4 + H2C=CH2 <=> H3C-CH2-SO4H

Another developing route to styrene is via benzene and ethane. This process is being developed by Snamprogetti S.p.A. and Dow. Ethane, along with ethylbenzene, is fed to a dehydrogenation reactor with a catalyst capable of simultaneously producing styrene and ethylene. The dehydrogenation effluent is cooled and separated and the ethylene stream is recycled to the alkylation unit. The process attempts to overcome previous shortcomings in earlier attempts to develop production of styrene from ethane and benzene, such as inefficient recovery of aromatics, production of high levels of heavies and tars, and inefficient separation of hydrogen and ethane. Development of the process is ongoing.

C6H6 + C2H6 --> C6H5-C2H5

C6H5-C2H5 ---> C6H5CH=CH2 + H2

By Friedel crafts acylation, ie treating benzene with any CH3COX, where X is a halide (AlCl3 t)

C6H6 + CH3COX = C6H5-CO-CH3 + HX

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