Todd:Chem3x11 ToddL5

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Chem3x11 Lecture 5

Under construction Sat May 5.

This lecture is about Neighbouring Group Participation (sometimes also called Anchimeric Assistance).

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Key concepts

• Groups/atoms with available electrons positioned near the carbon involved in a substitution reaction can influence the reaction
• 2
• 3

Simple Examples of NGP

A sulfur atom in the 2-position of an alkyl halide greatly increases the reactivity of that alkyl halide.

Scheme 1: Effect of a Sulfur Atom in the 2-Position of an Alkyl Chloride

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