1. Draw a Newman projection of the most stable conformational isomer of 2,4-dimethylhexane as viewed along the C3-C4 bond (C3 in front, C4 in back). Two templates are given with one hydrogen atom drawn in place. Note that only one template leads to the correct answer, therefore use only one of the given templates. H H.
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- 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.b. Draw a Newman projection of the given compound H viewed from C-2 to C-3 orientated according to the first template. Then use the Newman projection to demonstrate the most stable conformation around the C2-C3 bond according to the second template. (Hint: Order of decreasing group size 'Pr > CH2CH3 > CH3 > OH > Br > H] NH2 Me Ме H 'Pr Given conformation Most stable conformation2. Convert the line structure of 2,3-dimethylpentane into a Newman projection as viewed along the C2-C3 bond (C2 in front, C3 in back). Draw the most stable conformation. Two templates are given with one hydrogen atom drawn in place. Note that only one template leads to the correct answer, therefore use only one of the given templates. t Н. H.
- 2. *)Use either one of the chair cyclohexane templates I've provided below to draw the given compound in its lowest energy conformation. (Put H atoms at the ends of bonds in the template that don't point to other substituents.) H;C CH3 H.C HOFor the the structure shown below, Part A) Draw the Newman projections and 3-D sawhorse structures corresponding to the lowest and highest energy conformations for rotation around the C2-C3 bond. Draw the Newman projections looking FROM THE C2 CARBON TO THE C3 CARBON (i.e. with the C2 carbon in the "front"). Part B) Determine the energy difference between the lowest and highest conformations, and be sure to clearly show each energy contribution that you are including in your calculation. 2,3-dimethylpentane ECLIPSING Interactions AB Energy kcal/mol H/H 1.0 H / Me 1.4 H/Et 1.5 H/i-Pr 1.6 H/t-Bu 3.0 Me / Me 2.6 Me / Et 2.7 Me/i-Pr 3.0 GAUCHE A. Interactions Me / Me Me / Et Me / i-Pr Me / t-Bu Et / Et Et / -Pr Et/t-Bu i-Pr/i-Pr B Energy kcal/mol 0.9 0.95 1.1 2.7 1.1 1.6 3.0 2.0For the the structure shown below, Part A) Draw the Newman projections and 3-D sawhorse structures corresponding to the lowest and highest energy conformations for rotation around the C2-C3 bond. Draw the Newman projections looking FROM THE C2 CARBON TO THE C3 CARBON (i.e. with the C2 carbon in the "front"). Part B) Determine the energy difference between the lowest and highest conformations, and be sure to clearly show each energy contribution that you are including in your calculation. Lowest Energy Conformation 3-D sawhorse Newman ECLIPSING Interactions AB H/H H/Me H / Et H/i-Pr Energy kcal/mol 1.0 1.4 1.5 1.6 H/ t-Bu 3.0 Me / Me 2.6 Me / Et 2.7 Mei-Pr 3.0 GAUCHE A. Interactions Me / Me Me / Et Me / i-Pr Me / t-Bu Et / Et Et/i-Pr Et / t-Bu i-Pr/i-Pr 3-D sawhorse Energy kcal/mol Newman 0.9 0.95 1.1 2.7 1.1 1.6 Highest Energy Conformation 3.0 2.0
- Consider compound Q shown below (trimethylcyclohexane isomer). compound Q Which of the following is the most stable conformation of compound Q? E ||| CH3 Select one: O A. II B. I O C. III D. IV H CH3 CH3 H H CH3 CH3 H CH3 || H CH3 CH3 H CH3 CH3 CH3 IV CH3 "f H H2. For the following structure: (1S, 2R, 4R)-2-chloro-1-isopropyl-4-methylcyclohexane a. draw both chair conformations for the molecule b. identify whether the more stable stereoisomer.Will you always have a stable Newman chair? For example you have a cyclohexane and on 1 and 2 you have wedge methyl coming out and 4 and 5 you have dash Cl. What would the stable chair be. I think there is none
- Draw (1R,3S)-1,3-dimethylcyclohexane, in its minimum energy conformation. Then draw the Newman Projection for this structure with the correct stereochemistry and in its minimum energy state.a. Convert the following Newman projection of compound G to a three dimensional line structure in the given conformation. Place the aldehyde functional group on the right handside of according to the template. CH,OH NH2 HO. Pr H. Bu Gto Medical Chemistry II. (BMC1CHEM02) oard / My courses / Introduction to Medical Chemistry II. (BMCICHEM02) / 29/03 2021 Chemistry Electronic te Electronic test in Chemistry n3 Cyclobutane is more stable molecule than cyclopropane, because.... Select one: ut of it has less angle strain. cyclobutane has a cis-trans stereoisomers. cyclobutane is a larger ring. it has more torsional strain. cyclopropane is planar. Next page