For trans-1-ethyl-4-isopropylcyclohexane, which two chair
conformations are in equilibrium 
For trans-1-ethyl-4-isopropylcyclohexane, which two chair conformations are in equilibrium
(up) H-CH 1 2 5 4 6 (down) CH HCH trans-1-ethyl-4-isopropylcyclohexane
(up) CH2CH3 4 (down) .CH3 3 ring flip 2 CH HCHC. 2 3 4 (up) (down) CH C HU
CH-CH CH C HCH,C. H CH D
CH-CH CH C HCH,C. H CH D
We have been unable to transcribe this picture
Ideas and cause
Chirality heart: An atom (often carbon) which is bonded to 4 completely different atoms or teams is called chiral heart.
Within the chair conformer, if the atoms are dealing with in direction of up, then these atoms should be positioned at above the aircraft in cyclohexane ring construction. Equally, if the atoms are dealing with in direction of down, then these atoms should be positioned at under the aircraft within the cyclohexane ring construction.
Cis isomer accommodates two teams/substituents on the identical aspect of the ring (both each up or each down). Trans isomer accommodates two teams/substituents on the alternative aspect of the ring (one up and one down).
In chair conformation, theres steric interplay developed between the axial teams at first and third positions to one another. This kind of interplay known as 1,3-diaxial interplay.
At room temperature, chair conformation of cyclohexane can interconvert from one conformer to different very quickly. So, after interconversion, axial teams are modified to equatorial and vice-versa.
In each the chair conformations, the ethyl group is dealing with in direction of up and the isopropyl group is dealing with in direction of down.
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The six equatorial bonds one on every carbon, are available three units of two parallel ring bonds. Equatorial bonds alternate between sides across the ring.
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(up) H-CH 1 2 5 4 6 (down) CH HCH trans-1-ethyl-4-isopropylcyclohexane
(up) CH2CH3 4 (down) .CH3 3 ring flip 2 CH HCHC. 2 3 4 (up) (down) CH C HU
CH-CH CH C HCH,C. H CH D
CH-CH CH C HCH,C. H CH D
We have been unable to transcribe this picture
The ring flipping is as follows:
Thus, C and D chair conformations are in equilibrium.
(up) H-CH 1 2 5 4 6 (down) CH HCH trans-1-ethyl-4-isopropylcyclohexane
(up) CH2CH3 4 (down) .CH3 3 ring flip 2 CH HCHC. 2 3 4 (up) (down) CH C HU
CH-CH CH C HCH,C. H CH D
CH-CH CH C HCH,C. H CH D
We have been unable to transcribe this picture
At room temperature, chair conformation of cyclohexane can interconvert from one conformer to different very quickly. So, after interconversion, axial teams are modified to equatorial and vice-versa.
In each the chair conformations, the ethyl group is dealing with in direction of up and the isopropyl group is dealing with in direction of down.
The 2 chair conformations of trans-1-ethyl-4-isopropylcyclohexane are as follows:
(up) H-CH 1 2 5 4 6 (down) CH HCH trans-1-ethyl-4-isopropylcyclohexane
(up) CH2CH3 4 (down) .CH3 3 ring flip 2 CH HCHC. 2 3 4 (up) (down) CH C HU
CH-CH CH C HCH,C. H CH D
CH-CH CH C HCH,C. H CH D
We have been unable to transcribe this picture
Step-by-step
(up) H-CH 1 2 5 4 6 (down) CH HCH trans-1-ethyl-4-isopropylcyclohexane
(up) CH2CH3 4 (down) .CH3 3 ring flip 2 CH HCHC. 2 3 4 (up) (down) CH C HU
CH-CH CH C HCH,C. H CH D
CH-CH CH C HCH,C. H CH D
We have been unable to transcribe this picture
(up) H-CH 1 2 5 4 6 (down) CH HCH trans-1-ethyl-4-isopropylcyclohexane
(up) CH2CH3 4 (down) .CH3 3 ring flip 2 CH HCHC. 2 3 4 (up) (down) CH C HU
CH-CH CH C HCH,C. H CH D
CH-CH CH C HCH,C. H CH D
We have been unable to transcribe this picture
This post is last updated on hrtanswers.com at Date : 1st of September – 2022