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Which catalyst is used in the manufacture of isoprene by isomerization of propylene dimer?

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Which catalyst is used in the manufacture of isoprene by isomerization of propylene dimer?

(a) Triethyl aluminium

(b) Trimethyl aluminium

(c) Triphenyl aluminium

(d) Tripropyl aluminium

This question was addressed to me during an interview.

My question is based upon C3 Compounds in portion Synthetic Organic Chemical Industries of Chemical Technology

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Right choice is (d) Tripropyl aluminium

Explanation: A compressed propylene is reacted with tripropyl aluminium catalyst along with a carrier solvent at 200atms pressure in a reactor filled with heat transfer surface to remove exothermic heat of reaction.

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