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- Consider the Newman projection below. a. Draw a full Lewis structure of this molecule with R1=Me,R2=Et , and R3=iPr . b. Given the sizes of these R groups (R3R2R1) , does the Newman projection above show thelowest potential energy conformation of this bond? If not, draw a Newman projectionshowing the lowest P.E. conformation (sighting down this same bond). c. To draw a Newman projection in the lowest P.E. conformation, the following rule of thumbusually applies: Place the largest group on the front carbon anti to the largest group on theback carbon. Is your answer to the previous question consistent with this rule of thumb?H3C. H || IV Predict the correct splitting tree for circled hydrogen in the structure below. Br A) I B) II C) III D) IVH₂CO Predict the correct splitting tree for circled hydrogen in the structure below. || IV H H A) I B) II C) III D) IV
- 4) Draw the most stable and least stable Newman projections of the following compound viewed along the indicated bond. Br H2) Draw the most stable and least stable Newman Projections of the following molecules. Draw the Projection as indicated by the arrow. Haw H mm H B) * 1 c) HNI Br H TOH OHWhich of the following Newman projections is least stable? CH3 CH₂. H || CH3 I CH3 ||| IV All are equally stable CH3 CH₂, H3C CH3 II H H3C H CH3 CH₂ CH3 III -H H H CH3 CH₂ CH3 IV -H CH3
- 6. Newman projections to Lewis structures From the following Newman projections, draw the corresponding Lewis structure in the same conformation. A) B) H. H CH3 H₂C N H OH CI Br CH3 H OH CH316. The structure that corresponds to the below Newman projection is: CI H₂C A) II B) I C) III D) IV CI H₂C CH3 CI CI H₂C H H || H H CH3 CI CI H₂C CH₂ CI ||| CH3 CI CH3 CH3 IV CI CIمال H3CO Predict the correct splitting tree for circled hydrogen in the structure below. - IV A) I B) II C) ||| D) IV
- Draw the corresponding dash-wedge structure for each of the following Newman projections. (a) OCH,CH3 H. Br (b) H (c) H (d) HgC HyCH,CH3 H3C H H3C HYH CH,CH,CH3 CH3 (H3C),C CH3 H. HNO Consider the molecule below: H₂C H3C CH₂CH3 CH₂CH3 Consider rotation around the indicated bond. [1] Draw a Newman projection for the lowest energy conformer of this molecule looking down the indicated bond. [2] Draw a Newman projection for the highest energy conformer of this molecule looking down the indicated bond. # 3 d F4 % 5 F6 00Consider rotation about the indicated bond in the molecule below. Which Newman Projection formula best represents the most stable conformer of the molecule with respect to rotation about the indicated bond? [As noted below: there is no steric strain between -H and -Et that have a gauche, staggered relationship] H CH3 Br-C-C-CH₂CH3 H. H Br CH₂CH₂ 1 CH3 H CH3CH₂ H Br H₂C || H H₂C H Br H ||| Select one: OA. I O B. II O C. III O D. All conformers have identical energies. CH₂CH3 H NOTE CH3CH₂ H no steric strain