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Which of the following catalyst can be used in the synthesis of pyridine by Bönnemann cyclization?

Which of the following catalyst can be used in the synthesis of pyridine by Bönnemann cyclization? Correct Answer Cobalt catalyst

The trimerization of a part of a nitrile molecule and two parts of acetylene into pyridine is done with CoCp2(cod) (Cp = cyclopentadienyl, cod = 1,5-cyclooctadiene) as a catalyst, and can be performed even in water.

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