Homework Answers
The most stable conformation of
the cyclohexane is chair conformation.
The most stable chair conformation is the one which contains maximum number of substituents at the equitorial positions. If there is no possibility to keep all the substituents at the equitorial positions, keep the bulky groups at the equitorial position and small groups at the axial positions.
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3. (1 pt.) Draw the most stable chair conformation for the following trisubstituted cyclohexane (write letters...
draw the Newman projections. questions 1,2 and 3 1. (1 pts) 1 pts) Draw the Newman projection for the following spe...
draw the Newman projections. questions 1,2 and 3
1. (1 pts) 1 pts) Draw the Newman projection for the following species, looking down the between (i) ethyl and carboxylic acid group and (ii) OH and carboxylic acid group as the answer). in the bond indicated. Idell as anti, eclipsed or gauche соон OH (1) anti, eclipsed or gauche COOH WH HN (ii) anti, eclipsed or gauche 2. (1 pt.) Which conformation in question 1 is more stable (a) or (b)?...
A trisubstituted cyclohexane compound is given below in its chair conformation. Draw the planar...
A trisubstituted cyclohexane compound is given below in its chair conformation. Draw the corresponding planar (overhead) representation, using wedges and hashed bonds to indicate the substituent positions. To be graded properly, include the hydrogen atoms on the chirality centers (asymmetric carbons). Be sure that both wedges/hashed bonds are drawn on the outside of the ring, or else the stereochemistry may be interpreted as square planar.
Draw the following substituted cyclohexane in its most stable chair conformation. Clearly indicate which bonds are...
Draw the following substituted cyclohexane in its most stable
chair conformation. Clearly indicate which bonds are axial and
which bonds are equatorial and provide the systematic name for this
compound, using R/S designations to indicate stereochemistry.
CH3 CI CH3 CH3 H3C
with explanation 1) Draw a chair conformation of cyclohexane. Then, draw and level properly all axial...
with explanation
1) Draw a chair conformation of cyclohexane. Then, draw and level properly all axial and equatorial positions on chair form of cyclohexane. 2) Draw chair, half-chair and boat conformations of ethyl cyclohexane and draw an energy diagram to explain their relative stability: 3) Draw two possible chair conformations for each of the mono-substituted cyclohexanes and determine their relative stability with proper explanation. OH 4) Draw two possible chair conformations for each of the di-substituted cyclohexanes and determine their...
Draw tert-butyl cyclohexane in a chair conformation with the substituent in an axial position. Determine the...
Draw tert-butyl cyclohexane in a chair conformation with the substituent in an axial position. Determine the molecular formula and molecular mass of the compound.
3. (10 pts) For each cyclohexane, draw both chair conformations and circle the conformation that is...
3. (10 pts) For each cyclohexane, draw both chair conformations and circle the conformation that is more stable (use the relative size of each substituent to determine which has more 1,3-diaxial strain) S-Bu NH2 t-Bu /25 pts
The cyclohexane derivative shown exists primarily in the more stable of the two available chair conformations....
The cyclohexane derivative shown exists primarily in the more
stable of the two available chair conformations. Give the position,
axial or equatorial, of each of the three groups shown in the more
stable chair conformation. If a group divides its time equally
between axial and equatorial positions, indicate this with
ax/eq.
The table of "Axial Strain Energies for Monosubstituted
Cyclohexanes" found in the "Strain Energy Increments" section of
the Reference tool is useful for answering this
question.
The choices are...
I'm confused with the ring flip 3. (10 points) chair A. The cyclohexane ring depicted below...
I'm confused with the ring flip
3. (10 points) chair A. The cyclohexane ring depicted below undergoes a chair-flip to form CH3 H3C H3C CH3 chair lip CHa (a) Draw the missing substituents on chair A, clearly indicating whether they are in the axial or equatorial positions. (6 points) b) Are the bromide and hydroxyl groups cis or trans to each other? (2 points) (c) Is one chair conformation energetically more stable than the other? If so, indicate which chair...
E See page 188 17 Question (1 point) The structure of a trisubstituted cyclohexane is shown,...
E See page 188 17 Question (1 point) The structure of a trisubstituted cyclohexane is shown, but no information is given about whether the groups are "up" or "down": that is, wedge and dash notation has not been used. Change the bonds to each of these three groups to wedges or dashes to represent the structure that will have the most stable chair conformation. CH3 H3
38. Provide the correct hexagonal conformation or Ring-flipped chair conformations for the following cyclohexane (as parent...
38. Provide the correct hexagonal conformation or Ring-flipped chair conformations for the following cyclohexane (as parent chain) compounds. Then circle the more stable chair conformation. Flat Hexagon structure Chair conformation A H Chair conformation B CHS 2 Dr 2 Br 3 CH3 2 5 3 39. The following compounds have 2 stereogenic carbons, therefore 4 stereoisomeric structures (3 if there is a meso-form) These are not cyclic compounds. a) Draw the structure. b) Identify the stereogenic carbons. Assign the Cahn-Ingold-Prelog...
draw the Newman projections. questions 1,2 and 3
1. (1 pts) 1 pts) Draw the Newman projection for the following species, looking down the between (i) ethyl and carboxylic acid group and (ii) OH and carboxylic acid group as the answer). in the bond indicated. Idell as anti, eclipsed or gauche соон OH (1) anti, eclipsed or gauche COOH WH HN (ii) anti, eclipsed or gauche 2. (1 pt.) Which conformation in question 1 is more stable (a) or (b)?...
Draw the following substituted cyclohexane in its most stable
chair conformation. Clearly indicate which bonds are axial and
which bonds are equatorial and provide the systematic name for this
compound, using R/S designations to indicate stereochemistry.
CH3 CI CH3 CH3 H3C
with explanation
1) Draw a chair conformation of cyclohexane. Then, draw and level properly all axial and equatorial positions on chair form of cyclohexane. 2) Draw chair, half-chair and boat conformations of ethyl cyclohexane and draw an energy diagram to explain their relative stability: 3) Draw two possible chair conformations for each of the mono-substituted cyclohexanes and determine their relative stability with proper explanation. OH 4) Draw two possible chair conformations for each of the di-substituted cyclohexanes and determine their...
3. (10 pts) For each cyclohexane, draw both chair conformations and circle the conformation that is more stable (use the relative size of each substituent to determine which has more 1,3-diaxial strain) S-Bu NH2 t-Bu /25 pts
The cyclohexane derivative shown exists primarily in the more
stable of the two available chair conformations. Give the position,
axial or equatorial, of each of the three groups shown in the more
stable chair conformation. If a group divides its time equally
between axial and equatorial positions, indicate this with
ax/eq.
The table of "Axial Strain Energies for Monosubstituted
Cyclohexanes" found in the "Strain Energy Increments" section of
the Reference tool is useful for answering this
question.
The choices are...
I'm confused with the ring flip
3. (10 points) chair A. The cyclohexane ring depicted below undergoes a chair-flip to form CH3 H3C H3C CH3 chair lip CHa (a) Draw the missing substituents on chair A, clearly indicating whether they are in the axial or equatorial positions. (6 points) b) Are the bromide and hydroxyl groups cis or trans to each other? (2 points) (c) Is one chair conformation energetically more stable than the other? If so, indicate which chair...
E See page 188 17 Question (1 point) The structure of a trisubstituted cyclohexane is shown, but no information is given about whether the groups are "up" or "down": that is, wedge and dash notation has not been used. Change the bonds to each of these three groups to wedges or dashes to represent the structure that will have the most stable chair conformation. CH3 H3
38. Provide the correct hexagonal conformation or Ring-flipped chair conformations for the following cyclohexane (as parent chain) compounds. Then circle the more stable chair conformation. Flat Hexagon structure Chair conformation A H Chair conformation B CHS 2 Dr 2 Br 3 CH3 2 5 3 39. The following compounds have 2 stereogenic carbons, therefore 4 stereoisomeric structures (3 if there is a meso-form) These are not cyclic compounds. a) Draw the structure. b) Identify the stereogenic carbons. Assign the Cahn-Ingold-Prelog...
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