An experiment of synthesising ferrocene using potassium hydroxide and 1,2-dimethoxyethane reacted with freshly cracked cyclopentadiene was carried out. Before the addition of a solution containing iron(II) chloride tetrahydrate in DMSO to the first solution, the solution in the round bottom flask had greatly reduced in volume and had turned red in colour before adding any of the iron(II) chloride tetrahydrate in DMSO. What could be the possible reason for this? Explain why this had happened in detail. NOTE: The total yield was very low of ferrocene product.

Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter11: Reactions Of Alkyl Halides: Nucleophilic Substitutions And Eliminations
Section11.SE: Something Extra
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An experiment of synthesising ferrocene using potassium hydroxide and 1,2-dimethoxyethane reacted with freshly cracked cyclopentadiene was carried out. Before the addition of a solution containing iron(II) chloride tetrahydrate in DMSO to the first solution, the solution in the round bottom flask had greatly reduced in volume and had turned red in colour before adding any of the iron(II) chloride tetrahydrate in DMSO. What could be the possible reason for this? Explain why this had happened in detail. NOTE: The total yield was very low of ferrocene product.

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