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Regioselective Control of Electrophilic Aromatic Substitution Reactions

[ Vol. 1 , Issue. 3 ]

Author(s):

Keith Smith and Gamal A. El-Hiti   Pages 253 - 274 ( 22 )

Abstract:


para-Regioselective electrophilic aromatic substitution reactions, for example nitration, alkylation, acylation, sulfonylation and halogenation, can be achieved by carrying out reactions over solid catalysts such as zeolites, under modest conditions via shape-selectivity. By contrast, organolithium reagents can play an important role when ortho-products are desirable. ortho-Lithiation has been applied for the synthesis of more complex substituted heterocycles that are difficult to prepare by other means.

Keywords:

regioisomers, zeolites, electrophilic aromatic substitution reactions, directed lithiation, shape selectivity, heterocycles

Affiliation:

Centre for Clean Chemistry, Department of Chemistry, University of Wales Swansea, Singleton Park,Swansea, SA2 8PP, UK



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