Draw the more stable chair conformation of each of the following compounds in which an sp²-hybridized carbon atom is part of the ring. (a) (b) (c) (d) (e) Br
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- Which do you expect to be the more stable conformation of cis-1,3-dimethylcyclobutane, A or B? Why?Provide the least stable conformation of the following compound. IDraw the topological structure of the following molecule, clearly illustrating the stereochemistry.b) Draw in the box below the other chair conformation and identify the one that is the most stable between A and B. Briefly justify your choice.
- Draw this other chair conformation of methylcyclohexane and generalize as to what chair flipping does to substituents in terms of their equatorial/axial status.Explain why the following molecule prefers to adopt an axial conformation for the methyl group.Which of the following newman projections is The following for n -pentane The lowest energy conformation of What option represents a proper eclipsed conformation. What option is a proper anti conformation. What option is a proper gauche conformation.
- Pyrethrin II and pyrethrosin are two natural products isolated from plants of the chrysanthemum family. Pyrethrin II is a natural insecticide and is marketed as such. Q,)State the number of stereoisomers possible for each molecule.The diaxial conformation of cis-1, 3-dimethylcyclohexane is approximately 23 kJ/mol (5.4 kcal/mol) less stable than the diequatorial conformation. Draw the two possible chair conformations, and suggest a reason for the large energy difference.Build a model of methylcyclohexane, and use the model to complete the following Newmanprojections of methylcyclohexane in the chair conformation: a. When the methyl group is in an axial or equatorial (circle one) position, the molecule is inits lowest potential energy conformation. b. Label one Newman projection above anti and the other gauche to describe the relationshipbetween the methyl group and C3 of the ring. c. In general, which is a lower PE conformation, anti or gauche? d. Explain how your answer to b and c provide an explanation for why it is more favorable fora large group to be in an equatorial than an axial position.
- Provide the most stable (lowest energy) chair conformation of methylcyclohexaneIn the lowest energy chair conformation of cis-1,3-dimethylcyclohexane, how many axial positions are occupied by methyl groups?For the following molecule, draw both chair conformations. Using the rules of cyclohexane substituent stability, circle which is the more stable of the two
