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Best way to form a benzene ring?

I have to start with 1,3-butadiene and ethene to form a benzene ring, what is the best way to do this?

What I have come up with so far is hydrogenating the two alkenes to form butane and ethane and then reforming them to make hexane. From there I would reform the hexane chain into the cyclohexane right and then dehydrogenate that to make the benzene ring if I'm not mistaken, correct?

Problem is that I don't know how to show that last reaction on paper.

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  • 9 years ago
    Favorite Answer

    Whao! You making this hard work (forming the inert butane and ethane). It is known that Ni(0) catalyzes the trimerization of acetylene to benzene (google) so I would just pass ethylene through a soln of 1,3-butaadiene with a catalytic amount the commercially available Ni(COD)2 (COD = cyclooctadiene). If you want to get real fancy you could use a Grubbs' catalyst (google).

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