NBS Reaction
Aug 26, 2022, 16:45 IST
About NBS Reaction
The side chain halogenation of alkyl benzene takes place in the presence of light or high temperature. Side chain bromination is many times carried out by using the reagent N-bromosuccinimide (NBS) in the presence of light.
An alkyl benzene with side chain other than methyl may lead to the formation of more than one products.
Product (I) is the only product obtained, and formation of such product can be attributed to mechanism governing this reaction. Side chain halogenation has a similar mechanism as that of alkanes. It involves the formation of free radical intermediates. Now if we observe the free radicals formed by attack of Bromine free radical on Ethyl benzene, we will find that product (I) involves formation of Benzyl free radical and (II) involves formation of Primary free radical.
The benzyl free radical is more stable than primary free radical because its bond dissociation energy is 19 kcal/mole less than that of primary free radical.
Order of stability of free-radicals. Benzyl > Allyl > 3° > 2° > 1° (from bond dissociation energy data.
Find Mechanism of NBS Reaction
Related Link
- why does coordinate bonding happen ?
- How Ionic bond forms ? What are the properties
- How shapes of molecules are related to the type of hybridization
- Explain vsepr theory chart
- Molecular orbital theory examples
- what are the list of tests for Aldehydes and Ketones
- Explain all chemical Test for alcohol and phenols
- Explain tests for Amines
- Van't Hoff Factor(i)
- Depression of Freezing Point
- Elevation of boiling point
- Ideal and Non – Ideal Solutions
- Raoult’s Law
- Isomerism
- Conformations of Cyclohexane
- R and S configuration trick
- Enantiomers and Diastereomers
- What is Ambident nucleophile
- What is Benzyne mechanism
- what is stability order of carbocations
- E1 and E2 reactions
- Electrophilic aromatic substitution
- Halogenation of Benzene
- NBS Reaction
- Nitration of Benzene
- Nucleophilicity and basicity difference
- Ortho para meta positions
- Sulfonation of Benzene
- SN1 & SN2 Reaction Mechanism
- stability of free radicals
- Boyles law equation
- Charles law Definition
- ideal gas equation
- Dalton’s law of partial pressure
- van der waals equation
- kinetic theory of gases
- Graham’s law of diffusion
- Heat Capacity
- Second law of thermodynamics
- Gravimetric Analysis
- Volumetric Titration
- Iron
- potassium dichromate
- Potassium Permanganate
- Corrosion of iron
- Chemical compounds
- Properties and Molecular Structure of Oxygen
- What is Arrhenius equation ?
- Mechanism of Dehydration of Alcohol
- Hydrogen peroxide
- what is Conductometric titrations
- Explain Nernst Equation
- what is Kohlrausch’s law
- What is Conductance
- Faradays laws of electrolysis
- Half-life Period
- What is Order of reaction
- How to calculate Rate of Reactions
- Molecularity
- Entropy and Entropy change
- Define PH
- what is Buffer solutions
- solubility product
- Indicators in chemistry
- Distinguishing Tests For Organic Compounds
- Type of Ores
- Nuclear Chemistry Notes
- Bohr's Atomic Model And Its Limitations
- what are the types of isomerism
- Zeroth Law of Thermodynamics
- What is the Electronic configuration of iron and iron ions
- What is the physical properties of alkali metals?
- What are the characteristics of the alkaline earth metals?
- What is difference between electron proton and neutron?
- What are the properties of cathode rays?
- What is a Dash structural formula give an example?
- What is Hyperconjugation and inductive effect?
- How do you find the intermediates in a reaction?
- What are the three classification of hydrocarbons?
- What are the Physical properties of Alkenes?
- What is Law of chemical combination?
- Boron Hydride formation properties and Structures
- What are the Chemical Reaction of Boron
- Explain raoult's law for volatile solute
- Mendeleev’s Periodic Table
- What are the characteristics of long form of periodic table?
- What is electronic theory of chemical bonding?
- What are the properties of an ionic compound?
- What are Special forms of Hydrogen ?
- What are the chemical properties of water?
- What are the properties of the atom?
- what is wood charcoal and uses of wood charcoal ?
- What are the uses of noble gases?
- Do noble gases have chemical properties?
- What are the main components of environment?
- What are the harmful effects of chemicals?
- What is ideal and non ideal solution?
- What is the formula for heat capacity?
- What is reversible adiabatic expansion?
- What are the types of salt?
- What is buffer solution and types of buffer solution?
- What is the difference between physical adsorption and chemisorption ?
- What are the factors affecting adsorption?
- Copper Sulphate preparation & properties
- What is halogenation of benzene?
- Nitration of Benzene with Reactions
- What are the Physical properties of Haloalkanes?
- What are the chemical properties of Haloalkanes?
- What are the chemical properties of ethers?
- What is the commercial method of preparation of phenol?
- Reaction of carbonyl groups with HCN
- Oxidation of Aldehyde and Ketones
- Explain reactions of acetic acid?
- Method of preparation of acetyl chloride
- What are the of carbohydrates?
- What are the properties of glucose?
- Oxidizing agent List
- Reduced and oxidized
- What is The Meaning of Metallurgy
- Electronic Configuration of Elements
