Once the chromatographic column has been prepared, why is it important to allow

Question

Once the chromatographic column has been prepared, why is it important to allow the level of the liquid in the column to drop to the level of the alumina before applying the solution of the compound to be separated? 3. What is the structure of the intermediate species that attacks ferroncene to form acetylferrocene? 4. Why does the second acetyl group enter the unoccupied ring to form diacety|ferrocene? 1. Acetic anhydride is the excess reagent ferrocene is the limiting reagent) in this experiment In what step of the work-up procudire is this excess reagent destroyed? what product is obtained after it is destroyed? 2. why can hexanes be used to elute the unreacted ferrocene? why does acety|forrecene not move down the column along with ferrocene when using hexanes as the eluent? 3. If you wanted to modify the experimental procedure to synthesize what changes might you consider? consider each of the following stoichiometry reaction condition purification of final product by column chromatrography

Explanation / Answer

1) when we add water to the reaction mixture, acetic anhydride gets destroyed and gives acetic acid as a byproduct.

2) ferrocene is soluble in hexane and hence it gets eluted through the column.

3) stoichiometry and reaction conditions.

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