Which are the benzo fused heterocyclic compounds?

Which are the benzo fused heterocyclic compounds?

Quinoline, Isoquinoline, Indole, Benzothiophene, and Benzofuran are some important example of benzo fused heterocycles.

What is benzo fused ring?

The fusion of a benzene ring with five-membered aromatic heterocycles (π-excessive pyrrole, furan and thiophene) results in benzo[a], benzo[b] and benzo[c] fused heterocycles depending on the annelation of the benzene ring on to the ‘face a’ (1,2-bond), ‘face b’ (2,3-bond) and ‘face c’ (3,4-bond), respectively.

What are fused heterocyclic compounds?

Another large class of heterocycles refers to those fused to benzene rings. For example, the fused benzene derivatives of pyridine, thiophene, pyrrole, and furan are quinoline, benzothiophene, indole, and benzofuran, respectively. The fusion of two benzene rings gives rise to a third large family of compounds.

How do you name fused ring compounds?

1 Hydrocarbons consisting of four or more ortho-fused benzene rings in a rectilinear arrangement are named by citing a numerical prefix denoting the number of benzene rings followed by the term ‘-acene’ with elision of an ‘a’ . R-2.4.

What are bridged bicyclic compounds?

In bridged bicyclic compounds, the two rings share three or more atoms, separating the two bridgehead atoms by a bridge containing at least one atom. For example, norbornane, also known as bicyclo[2.2. 1]heptane, can be viewed as a pair of cyclopentane rings each sharing three of their five carbon atoms.

Which compound is not heteroaromatic?

electrons. Tetrahydrofuran is a heterocyclic compound. But it is not an aromatic compound. Although it contains a lone pair of electrons, these electrons are not delocalized as there is no conjugated system.

Why are 4 member rings unstable?

3 and 4 membered rings have high energy bond angles that are strained and unstable. 5 and 6 membered rings allow the bond angles to relax and that allows the compound to be more stable and energetically favorable.

Why are six membered rings the most stable type of Cycloalkane?

The cyclic compounds most commonly found in nature contain six-membered rings because they are the best compromise between ring strain and the chances of ring formation. Cyclopropane and cyclobutane rings are not common in nature. There is free rotation about the C-C single bonds.

Why do you put benzo in the name of a compound?

In organic chemistry the addition of the prefix benzo to the name of a chemical compound indicates the addition of an even number of carbon atoms to an unsaturated or already aromatic compound by which a new aromatic ring is formed.

Which is the extra ring of benzo fluoranthene?

Benzo [j]fluoranthene: by adding four carbon atoms to the parent compound, the ring at the bottom left is formed. Benzo [k]fluoranthene, the leftmost ring is the extra one, formed by adding four carbon atoms to the parent compound.

How many carbon atoms are in a benzo compound?

Between the prefix benzo and the name of the parent compound then place of the addition of the extra carbon atoms is indicated by letters written between square brackets. Quite often the number of added carbon atoms is four, although sometimes two else will do the job as shown in the following table.

Which is substituted for n 1 in benzo-fused N-heterocycle?

Commercially available pyrazoles were alkylated and formylated in a regiocontrolled manner to give pyrazole-5-aldehydes bearing 2,2-dialkoxyethyl substitution on N -1.