When it is treated with sodium ethoxide in deuterated ethanol (C2H5OD), cyclopentadiene exchanges all of its hydrogens for deuterium. Draw a structure for the intermediate in this reaction with all protons (no deuterons).

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When it is treated with sodium ethoxide in deuterated ethanol (C2H5OD), cyclopentadiene exchanges all of its hydrogens for deuterium.

Draw a structure for the intermediate in this reaction with all protons (no deuterons).

### Transcription and Explanation

#### Chemical Reaction

The image illustrates a chemical reaction involving the conversion of cyclopentadiene to a deuterated cyclopentadiene.

- **Reactant:** Cyclopentadiene (C₅H₆)
  - Structure: A five-membered carbon ring with two conjugated double bonds (a diene) and one hydrogen atom attached to each carbon in the ring.

- **Reagent:** Sodium ethoxide in deuterated ethanol (NaOC₂H₅/C₂H₅OD)
  - This reagent is used to exchange hydrogen atoms with deuterium atoms.

- **Product:** Deuterated Cyclopentadiene (C₅D₆)
  - Structure: Similar five-membered carbon ring with two conjugated double bonds. Each hydrogen atom in the original compound is substituted with a deuterium atom, represented by "D".

#### Reaction Mechanism
The reaction involves the deprotonation of cyclopentadiene to form a cyclopentadienyl anion, followed by the exchange of hydrogen atoms for deuterium atoms due to the presence of NaOC₂H₅/C₂H₅OD.

This reaction is an example of a deuterium exchange process, often used in organic chemistry to incorporate deuterium into molecules for studying reaction mechanisms or for use in spectroscopy.
Transcribed Image Text:### Transcription and Explanation #### Chemical Reaction The image illustrates a chemical reaction involving the conversion of cyclopentadiene to a deuterated cyclopentadiene. - **Reactant:** Cyclopentadiene (C₅H₆) - Structure: A five-membered carbon ring with two conjugated double bonds (a diene) and one hydrogen atom attached to each carbon in the ring. - **Reagent:** Sodium ethoxide in deuterated ethanol (NaOC₂H₅/C₂H₅OD) - This reagent is used to exchange hydrogen atoms with deuterium atoms. - **Product:** Deuterated Cyclopentadiene (C₅D₆) - Structure: Similar five-membered carbon ring with two conjugated double bonds. Each hydrogen atom in the original compound is substituted with a deuterium atom, represented by "D". #### Reaction Mechanism The reaction involves the deprotonation of cyclopentadiene to form a cyclopentadienyl anion, followed by the exchange of hydrogen atoms for deuterium atoms due to the presence of NaOC₂H₅/C₂H₅OD. This reaction is an example of a deuterium exchange process, often used in organic chemistry to incorporate deuterium into molecules for studying reaction mechanisms or for use in spectroscopy.
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