Bromine addition to trans-cinnamic acid - rectoria.unal.edu.co

Bromine addition to trans-cinnamic acid

Bromine addition to trans-cinnamic acid - for

Bromination of e stilbene post lab questions Bromination of e stilbene post lab questions section In order to form product Bromine MUST be present so if all the bromine is used and solution turns clear more bromine must be added to keep the reaction shifted to the right in order to favor the production of 2,3-dibromophenylpropanoic acid. Electrophilic Addition The most common applications of alkene halogenation are chlorination and bromination, which are electrophilic addition reactions. A question about bromination of acetone can someone help. Wear gloves when handling it and wash spills with water. Swirl the mixture to start dissolving the stilbene. bromine addition to trans-cinnamic acid.

This process depicted an electrophilic addition of a halogen to an asymmetrically substituted alkene.

A result of this process was the presence of a stereospecific Bromonium ion formed by the mechanism of the reaction. The subsequent attack by bromide ion at the opposite face to the Bromonium ion will yield the products of anti addition. Since the product has 2 chiral centers 4 stereoisomers are possible.

However, erythro diastereomers are most likely favored.

Erythro is the diastereomers that has two identical ligands on same side on fisher projection; while in threo diastereomers has two identical ligands on opposite sides of fisher projection. The mixture additoin later cooled to room temperature and then placed on an ice bath.

As the solution was cooled, small crystals rapidly formed at the bottom of the round bottom flask where impurities were present. After cooling, this mixture was separated using vacuum filtration, which allowed separating the 2,3-dibromophenylpropanoic acid.

The acid was rinsed 3 times with cold dichloromethane. It allowed the removal of any leftover bromine from the product and is also incapable of dissolving the product.

bromine addition to trans-cinnamic acid

The final product was weighed in to be 0. The theoretical melting point range was The reason for such a high yield was due to substance not being fully dried when weighing most likely.

bromine addition to trans-cinnamic acid

Post-Lab Questions: 1. Bromination is needed to add bromine atoms to the double bond by way of anti addition through a Bromonium ion intermediate.

bromine addition to trans-cinnamic acid

In order to form product Bromine MUST be present so if all the bromine is used and solution turns clear more bromine must be added to keep the reaction shifted to the right in order to favor the production of 2,3-dibromophenylpropanoic acid. The purpose of the reflux is to allow reaction to happen at a higher temperature addition not allow a high loss of solvent or product. Reflux is the process of boiling reactants while continually cooling the vapor returning it back to the flask as a liquid.]

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