IGNOU MCH 11 2026 2027 - Give a suitable chemical equation for the preparation of molybdenocene

Question

Give a suitable chemical equation for the preparation of molybdenocene. Gives its reaction with
ethylene.

05 Aug 2026

Answer :

Word Count : 373

Molybdenocene is a sandwich-type organometallic compound in which a molybdenum atom is bonded between two cyclopentadienyl rings. It is generally represented as molybdenocene, (\mathrm{Mo(\eta^5-C_5H_5)_2}). The cyclopentadienyl ligands stabilize the metal through strong metal–π interactions. Molybdenocene is an important example of a metallocene and exhibits characteristic reactions of transition-metal organometallic compounds. A suitable method for the preparation of molybdenocene involves the reaction of molybdenum tetrachloride with sodium cyclopentadienide. Sodium cyclopentadienide acts as a source of the cyclopentadienyl anion, which coordinates to the molybdenum centre. The reaction can be represented as: [ \mathrm{MoCl_4 + 2NaC_5H_5 \rightarrow Mo(C_5H_5)_2 + 4NaCl} ] The cyclopentadienyl groups coordinate to molybdenum in the (\eta^5) mode, meaning that all five carbon atoms of each ring participate in bonding with the metal. The resulting compound has

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