Draw a Newman projection for the conformer shown below as viewed from the left side of the molecule. H CI Br H3C H 075 The green eye shows you the direction you want to be looking at the molecule in your Newman projection. Select a template to begin. S Terms of Use | Pri
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- In the next chapter we'll look at cycloalkanes—saturated cyclic hydrocarbons—and we’ll see that the molecules generally adopt puckered, nonplanar conformations. Cyclohexane, for instance, has a puckered shape like a lounge chair rather than a flat shape. Why?Consider the molecule 1-bromo-2-methylbutane. C3 and C4 should be drawn as Et as in theexample. This group is called an ethyl group and can be considered a sphere about twice the sizeof a methyl group. Draw the following Newman projections sighting down the C1C2 bond... a. The lowest potential energy conformation. b. The highest potential energy staggered conformation.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?
- Draw a Newman projection showing the lowest P.E. conformation of the following moleculesighting down the C2C3 bond (as indicated below). Show methyl and ethyl groups as Me and Et.Draw the Newman projections for one staggered and one eclipsed conformation of the molecule below, viewed down the indicated bond in the direction of the arrow. Cl_H BrF) Circle the letter corresponding to the relationship of each pair of structures: Identical (I), Conformers (C), Enantiomers (E) (enantiomers can have different conformations). FIRST... determine the absolute configuration of chiral centers. H. ІН' I H | H с H Me E Me
- Draw the “chair twist" of the following molecules. Label the more stable conformation. Br •CH3 OH Draw planar models of the above molecules. Draw both chair conformation of the following molecule, and identify the most stable form. Me Me ....Et MeF) Circle the letter corresponding to the relationship of each pair of structures: Identical (I), Conformers (C), Enantiomers (E) (enantiomers can have different conformations). FIRST... determine the absolute configuration of chiral centers. H | F OH C H OH ESpecify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly shown are in the staggered conformation. 1. Torsional strain 2. Angle (ring) strain | 3. Steric (van der Waals) strain CH3 H F H H₂C CH3 ball & stick- + labels present not present