“There is no exception to the rule, that every rule has an exception.”- James Thurber. After learning all about aromaticity and antiaromaticity, we now proceed
Tag: Aromatic compounds
132.Criteria for Aromaticity(2).
Let us now begin to discuss the magnetic properties of aromatic compounds. 3]Magnetic properties. I) Aromatic ring current– Aromatic compounds have delocalised , closed loop
131.Aromaticity(24) – Criteria for aromaticity(1).
We have studied aromaticity in detail and are acquainted with various compounds that are aromatic. A variety of physical properties have been used as a
130.What is so special about 4n+2 π electrons?
We have been reiterating that aromatic compounds have 4n+2π electrons and antiaromatic compounds 4n π electrons. Ever wondered why these numbers are so important? Let’s
125.Polycyclic aromatic hydrocarbons(2)- Azulene,Anthracene, Phenanthrene, Pyrene, Phenacenes.
In the last post we studied naphthalene molecule in detail and we understood why it shows aromatic stability. Similarly , other polycyclic hydrocarbons are also
124.Polycyclic aromatic hydrocarbons(1)- Naphthalene.
In this post we shall discuss aromaticity of some polycyclic aromatic hydrocarbons (PAHs). What are polycyclic aromatic hydrocarbons? Poly = many cyclic = ring structure.
123.Aromaticity(16) – Heterocyclic aromatic systems(2)-Furan,pyrrole and thiophene.
Furan, Pyrrole and Thiophene. All the above structures are similar to each other , except for the fact that pyrrole has a lone pair and
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
110.Hückel Molecular theory (HMO).
Hückel’s molecular orbital(HMO) theory. The π- electron system in conjugated planar molecules can be treated independently of the σ framework. Aromaticity is usually described in
109. Hückel’s rule.
In the last post, we introduced ourselves to a new concept in organic chemistry – Aromaticity. We will continue to discuss it in this post.
108. Introduction.
From this post onwards we begin discussing a new topic in organic chemistry. This topic deals with a certain class of organic compounds, which are
107.Resonance structures
We studied the structure of benzene in the last post. However, the structure of benzene has many resonance contributors. The resonance structures of benzene can
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