5) Is it cyclic ? ✓ Conjugated double bonds ? ✓ Is it planar? × # of π electrons 8 # of lone pair of
Tag: aromaticity
134.Practice problems(1).
Q: Classify the following compounds as aromatic, anti-aromatic or non-aromatic – 1) Is it cyclic ? ✓ Conjugated double bonds ? ✓ Is it planar?
133.Homoaromaticity.
“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
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
129.Aromaticity(22) -Antiaromaticity.
Aromaticity refers to the extra stability that some cyclic compounds have, owing to their structure. Antiaromaticity means exactly the opposite of that. An aromatic compound
128.Fullerenes.
Elemental carbon in its sp2 hybridized state can form some very interesting structures, which have very wide applications in industry. Fullerenes are one such class
127.Annulenes (2).
Is [12]annulene aromatic? [12]annulene has 4n π electrons and so is anti-aromatic. It is highly unstable compound and exists only at very low temperatures. At
126. Annulenes(1).
Annulenes are completed conjugated monocyclic non-benzenoid hydrocarbons, with a general formula – CnHn ,when n is an even number CnHn+1 , when n is an
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.
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