What kind of isomerism is involved in the synthesis of dibenzalacetone?

Dibenzalacetone (trans, trans-1,5-diphenylpenta-1,4-dien-3-one) is prepared by the aldol condensation of acetone with excess benzaldehyde. You can have cis-trans isomerism about each of the double bonds. The possible combinations are cis,cis, cis,trans, trans,cis, and trans,trans.

What is the limiting reagent in aldol condensation?

What was the limiting reagent and reagent in excess in the conventional reaction? – limiting reagent: ketone (in this case acetone).

How is the synthesis of dibenzalacetone carried out?

Synthesis of Dibenzalacetone by Aldol Condensation. 1. To carry out a mixed aldol condensation reaction. 2. To study the mechanism of aldol condensation reaction. The reaction of an aldehyde with a ketone employing sodium hydroxide as the base is an example of a mixed aldol condensation reaction, the Claisen-Schmidt reaction.

How is aldol condensation used to make dibenzalacetone?

Condensation is a process which joins two or more molecules usually with the loss of a small molecule such as water or an alcohol. Aldol condensation (Claisen-Schmidt reaction) definitely is a process which join two carbonyl groups with a loss of water molecule in order to form β-hydroxyketone.

What kind of solvent is used to recrystallize dibenzalacetone?

The crude dibenzalacetone may be recrystallized from hot ethyl acetate, using 100 cc. of solvent for each 40 g. of material. The recovery in this purification is about 80 per cent; the purified product melts at 110–111°. 2.

What is the molar mass of dibenzalacetone?

H3C C CH3 O 1 Acetone molar mass: 58 g/mol density: 0.79g/mL limiting reagent + 12 C H O Benzaldehyde molar mass: 106 g/mol density: 1.04 g/mL an excess will be used NaOH, H2O, CH3CH2OH CC O C H H H H original acetone carbons Dibenzalacetone molar mass: 234 g/mol melting point: somewhere between 80 and 120ºC H3C C C H2 O H OH H3C C CH2