Add substituents to draw the conformer below (sighting down the indicated bond), then rotate the back carbon to provide the structure in the conformation that will be capable of an E2 elimination. R/S stereochemistry is graded. H3C H Br HIIIII H3CO CH2CH3 Q

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.

a model of cyclohexane in a chair conformation, and explain why the names “axial” and“equatorial’ are appropriate.

Draw the highest and lowest energy conformations. In cases where two or three conformations are degenerate, choose only one as your anwser. Use Pr, Me, H, Et in the structures.