Conversions Between Molecule View and Chair View

Key Questions

• What does "cis" isomer mean in cyclohexane ring?

  This, for example, can apply to ortho (1,2 connections) compounds. If carbons 1 and 2 have non-hydrogen substituents, trans implies that one substituent is in the back and one is in the front. If both are in front or both are in back, it is cis. Note that it also extrapolates to meta (1,3) and para (1,4) connections.

  Truong-Son N. · 1 · Apr 9 2015
• Why are trans alkenes more stable than cis alkenes?

  Answer:

  Trans alkenes are more stable than cis alkenes because they have fewer steric interactions.

  Explanation:

  

  In cis-but-2-ene, there is steric hindrance, because the methyl groups are on the same side of the double bond.

  Because of this steric crowding, there are van der Waals repulsive forces between the electron clouds of the groups.

  This decreases the stability of the cis alkene.

  In trans-but-2-ene, the methyl groups are on opposite sides of the double bond, and the repulsion does not occur.

  Ernest Z. · 34 · Jun 11 2015
• What does "trans" isomer mean in cyclohexane ring?

  This, for example, can apply to ortho (1,2 connections) compounds. If carbons 1 and 2 have non-hydrogen substituents, trans implies that one substituent is in the back and one is in the front. If both are in front or both are in back, it is cis. Note that it also extrapolates to meta (1,3) and para (1,4) connections.

  Truong-Son N. · 1 · Apr 9 2015

• What does "trans" isomer mean in cyclohexane ring?
• What does "cis" isomer mean in cyclohexane ring?
• Does the cis isomer or the trans isomer of 1,2-dimethylcyclohexane have one methyl group in an equatorial position and the other in an axial position?
• How can I draw for cis -1,2-diethylcyclohexane the two chair conformers and indicate which conformer is more stable?
• How can I draw for cis -1-ethyl-3-methylcyclohexane the two chair conformers and indicate which conformer is more stable?
• How can I draw trans-1,4-dimethylcyclohexane in its two chair conformations, and determine whether the two chairs are identical, conformational enantiomers, or conformational diastereomers? How can I do the same for the cis isomer?
• What is the energy profile in *cis*- and *trans*-3-bromo-6-methylcyclohexene?
• Question #78cc1