# Which chair conformer is more stable?

## Which chair conformer is more stable?

The most stable conformation of cyclohexane is the chair form shown to the right. The C-C-C bonds are very close to 109.5o, so it is almost free of angle strain. It is also a fully staggered conformation and so is free of torsional strain.

How do you know which conformer is more stable?

To find the most stable conformation, we choose the form with the least number of large axial groups; the least stable will have the most number of axial groups.

### Which is the more stable of the two chair conformers shown?

Out of two conformations, the one with lower energy is more stable. So, despite having two axial groups, the first conformer is more as two chlorines do not bring as much steric interaction as the methyl group.

What makes a chair conformer more stable?

The chair conformation is more stable because it does not have any steric hindrance or steric repulsion between the hydrogen bonds. These are hydrogens in the axial form. These hydrogens are in an equitorial form.

#### Which conformer is more stable and why?

…with respect to the other—the eclipsed conformation is the least stable, and the staggered conformation is the most stable. The eclipsed conformation is said to suffer torsional strain because of repulsive forces between electron pairs in the C―H bonds of adjacent carbons.

What makes a chair stable?

It turns out that a chair conformation minimizes what are called transannular interactions, in that each carbon on the ring as an axial hydrogen projecting out of the plane of the ring, or an equatorial hydrogen, more or less in the plane of the ring.

## Which chair conformation is lowest in energy?

The lower energy chair conformation is the one with three of the five substituents (including the bulky –CH2OH group) in the equatorial position. Exercise 3.7: Draw the two chair conformations of the six-carbon sugar mannose, being sure to clearly show each non-hydrogen substituent as axial or equatorial.

Why is the chair conformation more stable than boat?

Answer: Chair conformation of cyclohexane is more stable than boat form because in chair conformaion the C-H bonds are equally axial and equatorial, i.e., out of twelve C-H bonds, six are axial and six are equatorial and each carbon has one axial and one equatorial C-H bond.

### Which conformer is least stable?

eclipsed conformation
…with respect to the other—the eclipsed conformation is the least stable, and the staggered conformation is the most stable. The eclipsed conformation is said to suffer torsional strain because of repulsive forces between electron pairs in the C―H bonds of adjacent carbons.

Why is the boat conformer less stable than the chair conformer?

The boat conformation is again a puckered structure that allows tetrahedral bond angles. The boat conformation suffers from torsional strain, making it less stable (higher in energy) than the chair.

#### Is the chair or boat conformer more stable?

The chair conformation is more stable than the boat conformation. The boat conformation can sometimes be more stable than it is usually, by a slight rotation in the C-C bonds and is called the skew boat conformation. Nevertheless, the chair conformation is the most stable cyclohexane form.

Why is the chair conformation the most stable?

The chair conformation is the most stable due to the following reasons: The carbons in cyclohexane have sp3 hybridization and hence they tend to have an angle of 109.5 degrees. Since cyclohexane’s planar form results into bond angle being 120 degrees (which means a higher deviation from 109.5).

## Why is chair conformation more stable than boat conformation?

Cyclo hexane is more stable in chair form than in boat form due to following reasons. in chair form C-H bonds at adjacent carbons are staggered but in boat form some C – H bonds are fully eclipsed. In boat form there is repulsion between flagpole hydrogen.Distance between flagpole hydrogens is 1.8A it is very much less than vanderwaal radius of H .

What chair form of conformational isomers is the most stable?

The technique is based on the detection of chemical shifts of carbon atoms, which appear as distinct peaks. In methylcyclohexane , the chair conformation in which the large methyl group is equatorial is the most stable and, therefore, the most populated of all possible conformations.

### Which conformation is more stable?

The most stable conformation is anti at both bonds, whereas less stable conformations contain gauche interactions. One gauche-gauche conformer is particularly unfavorable because methyl groups are aligned with parallel bonds in close proximity. This conformation is called syn.

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