The process to determine the configuration, starts by placing the lowest prioritysubstituent toward the back.If the substituents pointing forward decrease in priority in a clockwise order, theconfiguration is S. If the substituents decrease in priority in a counterclockwise order,the configuration is R.TrueFalse

Answered: Image /qna-images/answer/8e7ce596-72e5-4143-92f7-f1738311e9af.jpg

Answered: The process to determine the…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter12: Chirality

Section: Chapter Questions

Problem 20CTQ

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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.
Draw both of the possible diastereomers of the molecule shown below. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable.
[Review Topics] [References] Draw a structural formula of the RS configuration of the compound shown below H I's CH3CHCHCO,H R NH2 threonine • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Include H atoms at chiral centers only. If a group is achiral, do not use wedged or hashed bonds on it. P. opy aste
5. Instead of redrawing the molecule to make the lowest priority group point back, alternatively, the lowest priority group can be swapped with the group that is currently pointing back. This is now the enantiomer of the original compound. The procedure is described below. Determine priorities of the groups attached to the stereocenter. Swap the lowest priority group with the group that is pointing back, and redraw (this is the enantiomer). iii. Determine the absolute configuration (R or S) of the enantiomer. iv. Determine the absolute configuration (R or S) of the original compound. i. ii. Answer the following questions. Completely fill in the circle in front of your chosen answer. (a) Assign priorities of the groups at this stereocenter (1 = highest priority; 2 = second priority; 3 = third priority; 4 = lowest priority). Each group must have a different priority: CH3 Br H CH3 *Br H3CH₂C H 3 O 4 (b) The absolute configuration of this compound is: OR OS CH₂CH3 1 02
Curved Arrows-start at a pair of electrons. Not an atom or a charge. Assume any stereocenters are (S). SN2 Curved Arrows (H3C)2CHCH₂CH₂CH₂C(Br)CH3 SN1 Curved Arrows (H3C)2CHCH₂CH₂CH₂C(Br)CH3. NaOCH₂CH3 HOCH₂CH3
If the sample of the pure R enantiomer of a molecule has a specific rotation of -40 degrees and your mixture of that molecule has an 82% ee S, what is the observed specific rotation of your sample?
For 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 2.0
For 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
Draw both chair confirmations of the substituted cyclohexane drawn below. Be certain to actually do a ring flip. Also be certain to very clearly distinguish axial from equatorial positions. Then circle the more stable conformation. Draw a planar representation of a stereoisomers which would have a higher heat of combustion and lower heat of combustion.
Draw the highest energy chair conformation when methyls1,3,and 5 are trans and when they are cis. Are there 1,3 diaxial interactions in the above models, Show by drawing.
For each structure, star (*) any asymmetric carbon atoms. label each asymmetric carbon as (R) or (S). draw any internal mirror planes of symmetry. label the structure as chiral or achiral. label any meso structures.*refer to the photo below
answer c and d please

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