Is 10 Annulene an aromatic compound?

Cyclodecapentaene or [10]annulene is an annulene with molecular formula C10H10. This organic compound is a conjugated 10 pi electron cyclic system and according to Huckel’s rule it should display aromaticity. It is not aromatic, however, because various types of ring strain destabilize an all-planar geometry.

Why is 10 Annulene not aromatic but 14 Annulene is?

10 annulene is a non aromatic compound in spite of satisfying all the conditions for aromaticity as due to repulsion in it , it changes its shape and thus becomes non planar . That’s why it can not be termed as aromatic any more and is thus known as non aromatic .

Is Annulene a aromatic?

[18]Annulene, for instance, is aromatic. Its carbon-carbon bond lengths are of nearly the same size and it posseses 4n+2 π electrons (with n = 4).

What makes a compound non aromatic?

Aromatic molecules are cyclic, conjugated, have (4n+2) pi electrons, and are flat. Anti-aromatic molecules are cyclic, conjugated, have (4n) pi electrons, and are flat. Non-aromatic molecules are every other molecule that fails one of these conditions.

Which of the following annulene is anti-aromatic in nature?

cyclobutadiene
Aromaticity. Annulenes may be aromatic (benzene, [6]annulene and [18]annulene), non-aromatic ([8] and [10]annulene), or anti-aromatic (cyclobutadiene, [4]annulene). Cyclobutadiene is the only annulene with considerable antiaromaticity, since planarity is unavoidable.

Is 14 annulene is aromatic according to Huckels rule?

The number of π-electrons for Hückel’s rule are 2 (n = 0), 6 (n = 1), 10 (n = 2), 14 (n = 3), 18 (n = 4) etc. Out of these only [14], [18], [30] annulenes have (4n + 2) π-electrons and are aromatic in nature.

What is the meaning of annulene in chemistry?

An annulene is an unsubstituted monocyclic hydrocarbon whose Lewis structure has alternating double bonds and single bonds. An annulene can be named as [n]annulene where n is the number of carbon atoms in the molecule. see also aromatic annulene, antiaromatic annulene, nonaromatic annulene.

What are aromatic rules?

Aromaticity Rules. Compounds that are aromatic are stabilized by their ability to de-localize their pi electrons. 1) The compound must be planar. 2) The compound must be cyclic. 4) The compound must obey Huckel’s rule, which states that an aromatic compound will have a number of pi electrons that is a solution of 4n+2, where n is an integer.

What makes a compound aromatic?

As mentioned above, aromatic compounds have a distinct aromatic ring which makes it different to other chemical compounds. This aromaticity arises due to the ‘benzene ring’. This is a typical chemical structure that contains six Carbon atoms, cyclically bonded with alternating double bonds.

What is an aromatic ring in chemistry?

Aromatic rings are hydrocarbons that contain benzene. (The above molecule is Benzene.Picture from Angelo State University) Aromatic rings have delocalized pi bonds – so each bond has a strength between a single and a double bond.

What are aromatic compounds?

Aromatic compounds, also known as arenes or aromatics, are chemical compounds that contain conjugated planar ring systems with delocalized pi electron clouds instead of discrete alternating single and double bonds. Typical aromatic compounds are benzene and toluene. They should satisfy Hückel’s rule.