Furan, Pyrrole and Thiophene. All the above structures are similar to each other , except for the fact that pyrrole has a lone pair and
Category: Organic Chemistry
122.Heterocyclic aromatic systems(1)-Pyridine.
In the last post we studied some examples of homocyclic aromatic compounds. What happens if the ring has an atom other than carbon in it?
121.Homocyclic charged aromatic systems.
Benzene with six π electrons – the aromatic sextet– is a “perfect” example of an aromatic compound. In this post we shall study some examples
120 .Cyclobutadiene and benzene.
We learned in detail how HMO theory explains the structure and aromaticity of benzene in previous posts. In this post let us compare benzene to
119.Frost Musulin diagram/ Polygon Method.
\ This is a very useful mnemonic device for quickly setting down molecular diagrams for cyclic systems. A Frost circle is a simple diagrammatic method
118.Aromaticity(11) – HMO treatment to benzene(2).
In the last post we saw how the HMO theory explains the aromaticity of benzene ring. In this post let us see how we get
117.HMO treatment to benzene(1).
In this post let us apply the HMO theory to see how and why benzene is aromatic i.e why does this molecule have that extra
116.Calculations of HMO theory(3).
In the last post we computed Hückel calculations for two p orbitals in conjugation. Let us now try to figure out how to calculate energies for
115.Calculations of HMO theory(2).
In the previous post we arrived at two simultaneous equations (We are using two different colors in order to distinguish between the two equations)- ciα
114.Calculations of HMO theory(1).
In this post let us apply the LCAO method and approximations we studied earlier to a simple conjugated molecule and carry out the calculations for
113 – Hückel approximations.
Before we proceed with learning the theory, we must acquaint ourselves with certain terms related to Hückel’s rule. Approximations – The energy of molecular orbitals
112.LCAO approach to HMO theory.
In the last post we got an overview of what matrices are and how they are used. Let us proceed further and see how this
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