18.1: Electrophilic Aromatic Substitution (EAS)
The majority of the reactions for benzene are Electrophilic Aromatic Substitution reactions. One of the benzene hydrogen atoms can be substituted for a different group with electrophilic properties followed by restoration of the stable aromatic ring.
Electrophilic aromatic substitution - Wikipedia
Electrophilic aromatic substitution (S E Ar) is an organic reaction in which an atom that is attached to an aromatic system (usually hydrogen) is replaced by an electrophile.
Electrophilic Aromatic Substitution: The Six Key Reactions
2017年7月11日 · We’ve shown six key electrophilic aromatic substitution reactions (chlorination, bromination, nitration, sulfonylation, and the Friedel-Crafts alkylation and acylation) and that they all involve the breakage of C-H and the formation of …
22.4: Electrophilic Aromatic Substitution - Chemistry LibreTexts
2021年7月31日 · Electrophilic addition to alkenes and electrophilic aromatic substitution are both polar, stepwise processes, and the key step for each is attack of an electrophile at carbon to form a cationic intermediate.
Electrophilic Aromatic Substitution Mechanism - Master …
2017年11月9日 · Electrophilic aromatic substitution (EAS) reactions proceed through a two-step mechanism. In the first step, the aromatic ring, acting as a nucleophile, attacks an electrophile (E+). This is the slow (rate-determining) step since it disrupts aromaticity and results in a carbocation intermediate.
16.1 Electrophilic Aromatic Substitution Reactions: Bromination …
An electrophilic aromatic substitution reaction begins in a similar way, but there are a number of differences. One difference is that aromatic rings are less reactive toward electrophiles than alkenes.
Electrophilic Aromatic Substitution - BYJU'S
Electrophilic aromatic substitution reactions are organic reactions wherein an electrophile replaces an atom which is attached to an aromatic ring. Commonly, these reactions involve the replacement of a hydrogen atom belonging to a benzene ring with an electrophile.
Ortho-, Para- and Meta- Directors in Electrophilic Aromatic Substitution
2018年1月29日 · Examples of ortho-, para – directors are hydroxyl groups, ethers, amines, alkyl groups, thiols, and halogens. Here’s a concrete example: the nitration of methoxybenzene (also known as anisole). ortho- and para- products dominate, while meta – …
14.2: Examples of electrophilic aromatic substitution
Nitration and sulfonation of benzene are two examples of electrophilic aromatic substitution. The nitronium ion (NO 2+) and sulfur trioxide (SO 3) are the electrophiles and individually react with benzene to give nitrobenzene and benzenesulfonic acid respectively.
18.1 Electrophilic Aromatic Substitution | Organic Chemistry
2021年3月4日 · Chad provides a thorough introduction to Electrophilic Aromatic Substitution (EAS) reactions in this lesson. He begins with the general mechanism of EAS reactions before covering the specific...