Beginner Topic 768 of 1102 Organic Chemistry
Electrophiles and Nucleophiles
Electrophiles seek electrons while nucleophiles donate electron pairs.
In-depth explanation of Electrophiles and Nucleophiles
An electrophile is an electron-deficient species that accepts an electron pair, such as H+, a carbocation or the carbon of a carbonyl group. A nucleophile is an electron-rich species that donates an electron pair, such as OH-, CN- or NH3, and it uses this pair to form a new bond. Most polar organic reactions are simply nucleophiles attacking electrophiles, with curly arrows showing the electron pair moving from the nucleophile to the electrophile. Understanding these roles lets you predict the products of many reactions quickly.
Going deeper: Electrophiles and Nucleophiles
Key ideas: Electrophiles accept electron pairs (H+, NO2+, Br+, carbocations, carbonyl carbon, Lewis acids like AlCl3). Nucleophiles donate pairs (OH-, CN-, NH3, H2O, alkoxides, enolates, pi bonds). Nucleophilicity rises down a group in protic solvents (I- > Br- > Cl-) and with charge, while basicity measures attack on H+. Arrows start at the nucleophile electron pair and end at the electrophile.
Common mistakes and connections: Students equate nucleophilicity with basicity; bulky tert-butoxide is a strong base but a poor nucleophile. Another error is drawing the arrow from the electrophile. Links to SN2 versus E2 competition, carbonyl chemistry and Lewis acid-base theory.
Visualization of Electrophiles and Nucleophiles
The nucleophile donates an electron pair to the electrophilic carbon while the leaving group departs, the basic electron-pair story of organic reactions. The interactive lesson shows this as a live animation or chart.
Worked example and use case
The hydroxide ion acts as a nucleophile and attacks the electron-poor carbon of bromomethane, CH3Br.
Frequently asked questions about Electrophiles and Nucleophiles
What is Electrophiles and Nucleophiles?
Electrophiles seek electrons while nucleophiles donate electron pairs.
Is Electrophiles and Nucleophiles a beginner, intermediate or advanced topic?
Electrophiles and Nucleophiles is a beginner topic in Organic Chemistry. It needs no earlier chemistry lessons and is a good starting point.
What should I learn before Electrophiles and Nucleophiles?
Study these earlier topics in Organic Chemistry first: Carbanions, Carbenes, Homolytic and Heterolytic Fission.
What comes after Electrophiles and Nucleophiles?
The next topics in Organic Chemistry are Reaction Types in Organic Chemistry and Free Radical Halogenation.
Can I practise Electrophiles and Nucleophiles with quizzes?
Yes. The interactive lesson includes a self-check question on Electrophiles and Nucleophiles, and the Organic Chemistry quiz draws on every topic in this area.
Where Electrophiles and Nucleophiles fits in Organic Chemistry
Electrophiles and Nucleophiles is topic 40 of 148 in Organic Chemistry.