What is a bicyclic structure?

A bicyclic molecule (bi = two, cycle = ring) is a molecule that features two joined rings. Bicyclic structures occur widely, for example in many biologically important molecules like α-thujene and camphor.

Which bonds are involved in ring fusion of cis decalin?

In cis decalin, the two cyclohexane rings are joined through an equatorial and an axial bond.

What is an equatorial chair conformation?

Equatorial: In cyclohexane, a bond which is perpendicular to the axis of the ring (i.e., the bond lies along the equator of the chair), or a group attached by such a bond.

Which of the following is a bicyclic base?

DBN is a bicyclic compound which is used as base.

Does decalin show geometrical isomerism?

Geometric isomerism exists in these compounds because the ring junction can be either cis or trans. The decalin ring junction can have hydrogen atoms on the same side or opposite sides. When they are on the same side, the molecule is cis-decalin. When they are on opposite sides, the molecule is trans-decalin.

What is equatorial and axial?

The key difference between axial and equatorial position is that axial bonds are vertical while equatorial bonds are horizontal. The terms axial and equatorial are important in showing the actual 3D positioning of the chemical bonds in a chair conformation cyclohexane molecule.

How do you determine axial and equatorial?

Axial groups alternate up and down, and are shown “vertical”. Equatorial groups are approximately horizontal, but actually somewhat distorted from that, so that the angle from the axial group is a bit more than a right angle — reflecting the common 109 degree bond angle.

What is the example of fused ring?

Example: Phenalene is considered as being composed of three benzene rings, each of which is ortho- and peri-fused to the other two. Any atom of a fused ring system which is common to two or more rings is termed a fusion atom.