How to make Propanal (propionaldehyde)

TL;DR

Learn how to synthesize propionaldehyde using a Fisher indole synthesis method, with a yield of about 46%.

Transcript

propene aldehyde is very specialized uses and none of which I'm very interested in except for one I plan to use the propyne aldehyde in a Fisher indole synthesis to produce cattle scat ole is an interesting molecule which unsurprisingly has the strong smell of feces so naturally I would definitely want to make it so for this experiment I used 25 mi... Read More

Key Insights

• 👃 Propionaldehyde has a distinct smell of feces, which makes it an interesting molecule to synthesize.
• ❓ The Fisher indole synthesis method can be used to synthesize propionaldehyde.
• ❓ A specialized distillation setup is necessary to separate the propionaldehyde from the reaction mixture promptly.
• ❓ The yield of propionaldehyde obtained in this synthesis is approximately 46%, consistent with literature reports.
• 😒 Purification of the propionaldehyde involves the use of activated sieves and fractional distillation.
• ❓ Potassium dichromate is used in the synthesis as an oxidizing agent.
• 💦 Safety precautions, such as adding acid to water and not the other way around, should be followed during the synthesis.

Questions & Answers

Q: What chemicals are needed to synthesize propionaldehyde using the Fisher indole synthesis method?

The chemicals required are n-propanol, potassium dichromate, concentrated sulfuric acid, and distilled water.

Q: Why is a specialized distillation setup necessary for this synthesis?

The specialized distillation setup is required to separate the propionaldehyde from the reaction mixture promptly, as prolonged exposure to the acidic environment can lead to further oxidation of the product.

Q: What is the yield of propionaldehyde achieved in this synthesis?

The yield of propionaldehyde obtained in this synthesis was approximately 46%, which is consistent with literature reports.

Q: How is the propionaldehyde purified after synthesis?

To remove any possible water content, activated sieves are added and stirred over them. Then, a fractional distillation is carried out to purify the propionaldehyde further.

Summary & Key Takeaways

• Propionaldehyde, known for its distinct smell of feces, can be synthesized using a Fisher indole synthesis method.

• The reaction requires n-propanol, potassium dichromate, concentrated sulfuric acid, and distilled water.

• A specialized distillation setup is necessary to ensure the propionaldehyde is separated from the reaction mixture promptly.