Question

(a)the cyclopentadienyl rings in ferrocene have aromatic character but cyclopentadiene itself has no such character. explain​

Answer 1

Answer:

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Answer 2

Since the existence of a $sp^{3}$ hybridized ring carbon on its ring, cyclopentadiene is not an aromatic molecule because it lacks an uninterrupted cyclic pi-electron cloud.

Ferrocene:

• Ferrocene has aromatic characteristics and is very thermally stable.
• It also has resistance to both acidic and basic chemicals.
• Ferrocene and its derivatives are antiknock compounds found in petrol engine fuel.
• They are less dangerous than the previously used tetraethyl lead.
• Kealy and Pauson discovered ferrocene, an organometallic substance, in 1951.
• They proposed a structure made up of an iron atom connected by two single bonds to two carbon atoms on different cyclopentadiene rings.

Cyclopentadienyl:

• Aside from being a precursor to cyclopentadienyl-based catalysts, cyclopentadiene's principal industrial application is as a precursor to comonomers.
• Cyclopentene is produced by semi-hydrogenation.
• The Diels–Alder reaction with butadiene produces ethylidene norbornene, a comonomer in EPDM rubber manufacturing.
• The positively charged ion of cyclopentadiene is anti-aromatic, whereas the negatively charged ion is aromatic.

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