Questions: Why is it necessary to exclude air from these reactions if both the r

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Questions: Why is it necessary to exclude air from these reactions if both the reactions and products are air-stable? plain why ferrocene sublimes so readily while the acetyl derivative does not. Ferrocene belongs to a class of compounds known as "sandwich" compounds. What other -sandwich" compounds are known. Please give relevant examples. 4. Further substitution of the acetylferrocene ortho to the acetyl group (x), with group Y produces (n.csHs Fe(ns-CsH3XY) derivatives what is unusual about this system? (think of a mimo Are both possible isomers superimposable? Ferrocene, (m'-CsHs Fe, can be derivatised by coupling with the diazonium salt of the colour change in the reaction on proceeding from the starting materials to the products and explain the final observed What has happened to the bands observed in the visible colour. region? (Conjugation?). nickelocene 6 Describe the synthesis and chemistry of nickelocene. How does the stability of er from ferrocene and explain in detail why? The use web based material must be clearly cited! of

Explanation / Answer

A)  An inert atmosphere must be maintained throughout the preparation to prevent air-oxidation of Fe2+ to Fe3+, which would prevent product formation. Therefore, air must be eliminated before the reaction.

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