Final answer:
When bromine is substituted in cyclohexane, one conformation has the bromine in an axial position, while the other conformation has the bromine in an equatorial position. The conformation with the bromine in the equatorial position is more stable. To draw the chair conformation of cyclohexane, follow the 5 steps provided.
Step-by-step explanation:
Conformations of monosubstituted cyclohexanes
When one of the H is replaced with a bulky group like –CH, group, the bulky group is at an equatorial position in one and at an axial position in the other chair conformation. The chair conformation with the bulky group at the equatorial position is more stable and more predominant at equilibrium than its flipped form with the bulky group at the axial position.
Drawing chair conformation of cyclohexane
Follow these 5 steps to draw the chair form of a cyclohexane ring:
- Draw two parallel lines slanting down, separated by about half their length, and the bottom line starting from about the middle of the first.
- Start a line from the lower end of the bottom line making a wide V shape, and extend it to about parallel to the top of the top line. Draw a line parallel to the first one as well.
- Connect the top of the right side line of step 2 to the bottom end of the top line of step 1 and do the same to the other line of step 2.
- Draw lines starting from the corners of the ring, going upwards from the corners pointing up, and going downwards from the corners pointing down.
- Draw lines starting from the corners making a big V-shape to the axial bond and approximately parallel to the bond one bond away in the ring.