How to prepare benzophenone from benzene
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The most obvious method has been mentioned by others here - the Friedel-Crafts acylation of benzene with benzoyl chloride in the presence of a Lewis Acid (e.g. AlCl3).
It is also possible to produce benzophenone from the reaction of benzene with CO2 under appropriate conditions. Profs. Olah and Prakash observed significant production of benzophenone when trying to optimize the carboxylation of benzene with CO2 under AlCl3/Al catalysis. In this case, you have a Friedel-Crafts carboxylation of benzene with CO2 (which is quite challenging to do!) followed by an in situ acylation with benzene by the intermediate benzoyl cation.
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