What is a reasonable solvent to use to dissolve the original mixture of ferrocen

Question

What is a reasonable solvent to use to dissolve the original mixture of ferrocene and acetylferrocene so that it can be spotted on the TLC plate for analysis? Hexane methylene chloride toluene All of the solvents would work. During the column chromatography procedure, what eluting solvents) should the 90:10 hexanes/ethyl acetate be changed to, and when should the change take place? Change the solvent to 20:80 ethyl acetate/hexanes when separation of ferrocene from acetylferrocene has begun. Change the solvent to 20:80 ethyl acetate/hexanes when the first fraction begins to be collected. Change the solvent to 20:80 ethyl acetate/hexanes after the first fraction has been almost collected. Change the solvent to 20:80 ethyl acetate/hexanes when the first band has traveled half a column down.

Explanation / Answer

2) Ferrocene is organometallic compound where Iron is sandwitch between two cyclopentadenyl ring

Ferrocene is insoluible in water but soluible in most of organic solvents it is soluible

Answer: all of the solvents work

3)

Change the solvent 20:80 ethyl acetate / hexane after first fraction has been almost collected

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