Friedel-Crafts Alkylation and Acylation Friedel-Crafts reactions are a class of electrophilic aromatic substitution (EAS) reactions that introduce alkyl or acyl groups onto an aromatic ring. These reactions are named after the chemists Charles Friedel and James Crafts, who developed them in the late 19th century. Below is a detailed explanation of both Friedel-Crafts alkylation and … Read more
Halogenation, Nitration, and Sulfonation These are three important types of electrophilic aromatic substitution (EAS) reactions, where an electrophile replaces a hydrogen atom on an aromatic ring (e.g., benzene). Below is a detailed explanation of each reaction, including their mechanisms, reagents, and examples. 1. Halogenation 2. Nitration 3. Sulfonation Summary of Halogenation, Nitration, and Sulfonation: Reaction … Read more
Electrophilic Aromatic Substitution (EAS) Electrophilic aromatic substitution (EAS) is a type of organic reaction in which an electrophile (an electron-deficient species) replaces a hydrogen atom on an aromatic ring (e.g., benzene). This reaction is characteristic of aromatic compounds due to their stability and electron-rich π-system. General Mechanism of EAS: General Reaction: [\text{Aromatic Ring} + E^+ … Read more
Hückel’s Rule of Aromaticity Hückel’s rule is a fundamental concept in organic chemistry used to determine whether a planar, cyclic molecule is aromatic. Aromatic compounds are exceptionally stable due to their delocalized π-electron system. Hückel’s rule provides a simple way to predict aromaticity based on the number of π-electrons in the molecule. Hückel’s Rule Statement: … Read more
Enantiomers, Diastereomers, and Meso Compounds These are types of stereoisomers, which are molecules with the same molecular formula and connectivity but different spatial arrangements of atoms. Here’s a detailed explanation of each: 1. Enantiomers 2. Diastereomers 3. Meso Compounds Comparison of Enantiomers, Diastereomers, and Meso Compounds: Feature Enantiomers Diastereomers Meso Compounds Mirror Image Non-superimposable mirror … Read more
Chirality and Chiral Molecules 1. Definition of Chirality: 2. Key Features of Chiral Molecules: 3. Examples of Chiral Molecules: 4. Identifying Chirality: 5. Importance of Chirality: 6. Practice Problem: Identify whether the following molecule is chiral or achiral:[CH_3-CH(Cl)-CH_2-CH_3] Summary:
Markovnikov’s Rule and Anti-Markovnikov’s Rule (Kharash Effect) These rules describe the regioselectivity of addition reactions to unsymmetrical alkenes (alkenes with different groups on each carbon of the double bond). The rules predict where the new atoms or groups will add during the reaction. 1. Markovnikov’s Rule 2. Anti-Markovnikov’s Rule (Kharash Effect) Key Differences: Feature Markovnikov’s … Read more
Saytzeff and Hofmann Products In elimination reactions (such as E1 and E2), the formation of alkenes can lead to different products depending on the structure of the starting material and the reaction conditions. The two main types of products are: 1. Saytzeff (Zaitsev) Product 2. Hofmann Product Key Differences: Feature Saytzeff Product Hofmann Product Substitution … Read more
Cahn-Ingold-Prelog (CIP) Rules The Cahn-Ingold-Prelog (CIP) rules are a set of guidelines used to assign priorities to groups attached to a stereocenter (in R/S nomenclature) or a double bond (in E/Z nomenclature). These rules are essential for determining the absolute configuration of chiral molecules and the geometry of double bonds. Key Principles of CIP Rules: … Read more
E/Z Nomenclature The E/Z nomenclature is a system used to describe the configuration of double bonds in alkenes (or other compounds with double bonds) when there are two different groups on each carbon of the double bond. It is based on the Cahn-Ingold-Prelog (CIP) priority rules, similar to the R/S system for chiral centers. Key … Read more
