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Published byDenis Norton Modified over 8 years ago
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Steric hinderance between the ortho hydrogens makes it impossible for the three phenyl rings to be coplanar. Instead the triphenylmethyl carbocation assumes a “ propeller ” conformation with the phenyl rings pitched at a 32° angle.
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The triphenylmethyl cation can be prepared by reaction of a Grignard reagent with benzophenone to form triphenylmethyl alcohol. Treatment with fluoboric acid results in the trityl carbocation.
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Safety Notes for Expt. 30 – Synthesis of Triphenylmethanol and the Trityl Carbocation
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Physical Properties of the Reactants and Reagents in Expt. 30
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IR Spectra of bromobenzene and benzophenone
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Setup of the round-bottom flask, Claisen adapter, West condenser and addition funnel
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A drying tube is added to the top of the condenser
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