Which isomer has the methyl groups in axial?

The cis isomer has one methyl group on axial and one on equatorial, both in UP orientation, while the trans isomer has both methyl groups on axial, one in UP and one in DOWN.

How do you know if a group is equatorial or axial?

Axial bonds alternate up and down, and are shown “vertical”. Equatorial groups are approximately horizontal, but actually somewhat distorted from that (slightly up or slightly down), so that the angle from the axial group is a bit more than a right angle — reflecting the common 109.5o bond angle.

What is axial group?

Axial: In cyclohexane, a bond which is parallel to the axis of the ring, or a group attached by such a bond.

Which orientation of the methyl group axial or equatorial is higher in energy?

Note that in the conformation where methyl is axial, there is a gauche interaction between the axial methyl group and C-3. This is absent in the conformation where methyl is equatorial. This gauche interaction is an example of van der Waals strain, which is what makes the axial conformer higher in energy.

What is the position of two methyl groups?

2.2. 2 Reactivity of alkyl groups. Methyl groups in the 2-, 4- or 6-position of pyrimidine are ‘active’ in the sense of that in 2,4-dinitrotoluene; in the 5-position, a methyl group resembles that of toluene itself.

What is equatorial and axial position?

Axial positions are perpendicular to the plane of the ring and equatorial positions are around the plane of the ring. The bond angles in this conformation are 110.9˚

What is axial position?

What is Axial Position? Axial position is the vertical chemical bonding in the chair conformation of cyclohexane. Due to the minimized steric hindrance, the chair conformation is the most stable structure for the cyclohexane molecule. The axial position is perpendicular to the plane of the ring of cyclohexane.

When methyl group is in axial position in methyl cyclohexane The molecule has?

Note: A methyl group is larger than a hydrogen atom. Remember when a bulkier group in cyclohexane is present in the axial position, the larger group and the hydrogen atom present in the axial position of the ring will repel each other and these interactions are called as axial-axial interaction or gauche interaction.

When methyl group is in axial position in methyl cyclohexane The molecule has conformer?

Both chair conformers have one methyl group in an axial position and one methyl group in an equatorial position giving both the same relative stability. The steric strain created by the 1,3-diaxial interactions of a methyl group in an axial position (versus equatorial) is 7.6 kJ/mol (from Table 4.7.

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