“There is no exception to the rule, that every rule has an exception.”- James Thurber. We studied aromaticity and antiaromaticity in detail. In this post,
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
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
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
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