Why is pyridinium tribromide used instead of Br2?
In these two bromination reactions, pyridinium tribromide will be used as the source of bromine. This solid reagent is safer and easier to handle than elemental bromine, which is a highly corrosive liquid.
How many products are possible for the addition of bromine to cis-stilbene?
The reaction of cis-stilbene with Br2 could generate four possible products labeled A, B, C and D.
What is the product of the bromination of cis stilbene?
Bromination of trans-stilbene produces predominantly meso-1,2-dibromo-1,2-diphenylethane (sometimes called meso-stilbene dibromide), in line with a mechanism involving a cyclic bromonium ion intermediate of a typical electrophilic bromine addition reaction; cis-stilbene yields a racemic mixture of the two enantiomers …
Why is Z stilbene not planar explain?
Stilbene exists as two possible isomers known as (E)-stilbene and (Z)-stilbene. (Z)-Stilbene is sterically hindered and less stable because the steric interactions force the aromatic rings 43° out-of-plane and prevent conjugation.
What is the molar mass of stilbene?
180.25 g/mol
(E)-Stilbene/Molar mass
How is bromine used in the bromination of stilbene?
Bromine and chlorine readily undergo addition reactions with alkenes. This practical involves the bromination of trans-stilbene using a 10% bromine dichloromethane solution. Hence, an addition reaction takes place an 1,2-dibromo-1,2-diphenylethane is formed.
How are cis and trans isomers of stilbene different?
Since the cis and trans isomers of stilbene have different geometries, it follows that upon reaction with bromine they give rise to stereoisomeric bromonium ions and, eventually, products that differ only by their stereochemistry. The product of this reaction, 1,2-dibromo-1,2-diphenylethane, has two stereogenic
When does the bromine act as an electrophile?
Hence, an addition reaction takes place an 1,2-dibromo-1,2-diphenylethane is formed. MECHANSIM: The alkene, trans-stilbene, acts as a nucleophile and the bromine acts as an electrophile. Hence, the nucleophilic double bond undergoes an electrophilic addition reaction by the bromine reagent.
Is the bromine reagent used in the bromination experiment?
The aim of this experiment is to carry out an addition reaction using trans-stilbene and bromine reagent to produce 1,2-dibromo-1,2-diphenylethane. As most chemicals used in this experiment are toxic / harmful, PPE must be used throughout and the experiment should be carried out inside a fume hood.