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HETEROCYCLIC COMPOUNDS

Lecture note- 3 Organic Chemistry CHE 502 HETEROCYCLIC COMPOUNDS Co-Coordinator Dr. Shalini Singh DEPARTMENT OF CHEMISTRY UTTARAKHAND OPEN UNIVERSITY UNIT 4: HETEROCYCLIC COMPOUNDS - I CONTENTS Objectives Introduction Classification of HETEROCYCLIC COMPOUNDS Nomenclature of HETEROCYCLIC COMPOUNDS Molecular orbital picture Structure and aromaticity of pyrrole, furan, thiophene and pyridine Methods of synthesis properties and chemical reactions of Pyrrole, Furan, Thiophene and Pyridine Comparison of basicity of Pyridine, Piperidine and Pyrrole Summary Terminal Question OBJECTIVES In this unit learner will be able to Know about the most important simple HETEROCYCLIC ring systems containing heteroatom and their systems of nomenclature and numbering.

The aromatic heterocyclic compounds also follow the Huckel’s rule. According to Huckel’s rule an aromatic compounds must be cyclic in nature with planar geometry due to conjugate double bonds and must have (4n+2)π electrons. Examples of aromatic heterocyclic compounds are shown in figure 2. O Furan NH Pyrrole S Thiophene N Pyridine N H ...

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