The aldol reaction lab report

Aldol condensation reaction

All essential apparatus was set up accordingly to synthesize both dibenzylacetone and benzylacetophenone. Theory: Condensation reaction is also known as a dehydration reaction. Questions 1. For the first part, a mixture of sodium hydroxide 40mL; 2M and ethanol 30mL was made in a clonical flask. In the mechanism of condensation reaction, a bond is formed between two molecules and creates water as a byproduct. The percent yield I calculated was Also, during recrystallization, a slight excess of ethanol may have diluted the solution too much as the crystals that formed were very small which also explains why the percentage yield was quite small. This is probably due to impurities still left in the sample due to inadequate washing with deionised water and also perhaps the excess of ethanol. Introduction In order to produce a resonance stabilized unsaturated ketone a crossed aldol condensation reaction is used so that the intermediate can undergo dehydration. Half of the benzaldehyde and acetone mixture was added to the clonical flask with the sodium hydroxide and ethanol in it. Usually in aldol reactions there are 4 products, but because one of the reactants has no alpha hydrogens it can only make 2 products. When each product was dry, it was washed with 3 aliquots of deionised water 3x 60mL. These results are my neighbour Ciara O Flynns results. Melting points are very useful in chemistry. This process creates a beta-hydroxy carbonyl, which is called aldol.

The practical was completed in two parts. Which means that acetophenone will be the one that will donate a proton to a base to form an enolate that will serve as the nucleophile that is then added to the carbonyl group of the benzaldehde.

in this aldol reaction, what is the nucleophile that attacks the carbonyl group of benzaldehyde?

They give us an idea as to whether a compound contains impurities or not. At least one of the reactants must have an alpha hydrogen or the reaction does not work.

Michael and aldol condensation reactions lab report

This resulted in a reasonable percentage yield that probably would have been a good bit lower minus the impurities left in the sample. A mixture of sodium hydroxide 40mL; 2M and ethanol 30mL was made in a clonical flask. The crystals formed in each case were recrystallized by dissolving each set in ethanol and using heat from the hot plates. Usually in aldol reactions there are 4 products, but because one of the reactants has no alpha hydrogens it can only make 2 products. Generally it forms an alkene. Words: , Paragraphs: 11, Pages: 2 Publication date: April 15, Sorry, but copying text is forbidden on this website! It refreshed my memory on how to conduct aldol reactions.

The dried crystalline products were weighed and the melting point ranges determined for each solid. Theory: Condensation reaction is also known as a dehydration reaction.

Aldol condensation lab report discussion

Questions 1. I may have over diluted the solution which in turn affected the reformation of crystals. After both mixtures were left for 30 minutes they were dried off using a vacuum filtration. In the first steps of both of these reactions, when there is aldol addition, the product undergoes a loss of water made from the alpha hydrogen and the hydroxyl group from sodium hydroxide. When each product was dry, it was washed with 3 aliquots of deionised water 3x 60mL. This is a dimer of benzaldehyde and acetone. There wasnt necessarily any errors made for product B except for the fact that we ran out of time to finish the experiment. The crystals formed in each case were recrystallized by dissolving each set in ethanol and using heat from the hot plates. The dried crystalline products were weighed and the melting point ranges determined for each solid.

Purpose: The purpose of this experiment is to be able to conduct an aldol condensation reaction using an unknown aldehyde and an unknown ketone. This is probably due to impurities still left in the sample due to inadequate washing with deionised water and also perhaps the excess of ethanol.

For aldol addition reaction, the alpha carbon of one aldehyde or ketone adds to the carbonyl group of the other ketone or aldehyde.

self aldol condensation

Each product was placed into its own Buchner funnel and sucked dry. References: 1. Generally it forms an alkene.

aldol condensation lab report abstract

In the mechanism of condensation reaction, a bond is formed between two molecules and creates water as a byproduct.

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Aldol Condensation Lab