Show two different eclipsed and two different staggered
conformtations of the molecule 2-methylbutane using the partial
structures below and drawing in methyl groups where appropriate.
Underneath each calculate the total strain energy for each
structure given the torsional energies: [eclipsing H to H = 1 kcal,
H to CH3 = 1.5 kcal & CH3 to
CH3 = 4 kcal, and gauche CH3 to
CH3 = 0.9 kcal]. Then determine the barrier to rotation
around the C2-C3 bond in the
molecule.
Homework Answers
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Show two different eclipsed and two different staggered
conformtations of the molecule 2-methylbutane using the partial...
Question 6 (2 points) Consider the rotation around the C2-C3 bond of 2-methylbutane. Using the values...
Question 6 (2 points) Consider the rotation around the C2-C3 bond of 2-methylbutane. Using the values listed below, calculate the energy corresponding to (eclipsed or staggered) conformations at each 60° rotation. Define the dihedral angle (6) as the angle between the H on C2 and the methyl group on C3. Begin at the O° dihedral angle (placing C2 in front and C3 in back) and turn clockwise the front carbon. H,H eclipsing interaction = 1 kcal/mol H,CH3 eclipsing interaction =...
x Consider 2,2,3-trimethylbuttane. Using a Newman projection formula, draw the most stable conformation, sighting along the...
x Consider 2,2,3-trimethylbuttane. Using a Newman projection formula, draw the most stable conformation, sighting along the C2-C3 bond. Compute the total strain energy for this conformation. Refer to strain energy values given below. Strain energies with respect to atoms/groups bonded to C-C (one atom/group bonded to each C) H <---> H eclipsed: 4 kJ/mol CH3 <---> H eclipsed: 6 kJ/mol CH3 <----> CH3 eclipsed: 11 kJ/mol CH3 <----> CH3 gauche staggered: 3.8 kJ/mol Selected Answer: D. 7.6 kJ/mol Answers: A....
REPORT SHEET FOR CONFORMATIONAL ANALYSIS OF ALKANES AND CYCLOALKANES Ethane caMMFF Calculated Energies (kcal/mole) from Property...
REPORT SHEET FOR CONFORMATIONAL ANALYSIS OF ALKANES AND CYCLOALKANES Ethane caMMFF Calculated Energies (kcal/mole) from Property box MMFF Energy AMI Energy (heat of 3-21GO Energy kJ/mole Compound Ethane staggered Ethane eclipsed: formation) (kJ/mole a.u Note: I a.u. (atomic unit)-I hartree 2625.5 kJ/mole For each calculation determine the energy barrier to rotation around the C-C bond in units of kJ/mole by subtracting the energy of eclipsed from the energy of staggered. (Hint: to obtain the 3-21G) value, subtract energies first, then...
In-Class Worksheet In the box below each molecule, draw Newman projections for the structures A, B,...
In-Class Worksheet In the box below each molecule, draw Newman projections for the structures A, B, and C shown from the perspective indicated. For each Newman projection that you've drawn, indicate if there are any eclipsed bonds or 1. gauche butane interactions. H H CH3 H3C CH3 CH3 H. H3C CH3 H CH3 H H Structure C Structure B Structure A Structure A can exist in a lower energy conformation by undergoing a bond rotation; draw the Newman projection of...
I already know how to do 1 and 2. if you could show me how to...
I already know how to do 1 and 2. if you could show me how to do
number 3 on the graph above, and how to calculate the expected
energy of the conformer please
1 60 120 180 240 300 360 Torsion angle (degrees) AE (kcal/mol) In the box below each molecule, draw Newman projections for the structures A, B, and C shown from the perspective indicated. For each Newman projection that you've drawn, indicate if there are any eclipsed...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calcula...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) A CH3...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments)...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions (axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) OH H3C...
please answer question 5 based on the drawing probided of 2-methyl butane. please indicate whether it...
please answer
question 5 based on the drawing probided of 2-methyl butane. please
indicate whether it is dihedral or degrees rotation
o. chemistry homework
5. Draw an energy diagram on a separate sheet of graph paper, plotting the approximate conformer energies against dihedral angles OR degrees rotation. You will have to estimate the potential energies based on your drawings. Grading for energy diagram graphs: Use an entire page in your laboratory notebook-it is graph paper Graphs must have a title...
Strain Energy Increments Strain Energy for Alkanes Interaction/Compound kJ/mol kcal/ 4.0 H: Heclipsing 1.0 H: CH3...
Strain Energy Increments Strain Energy for Alkanes Interaction/Compound kJ/mol kcal/ 4.0 H: Heclipsing 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 6.3 cycloheptane 26.2 cyclooctane 40.5 9.7 Axial Strain Energies for Monosubstituted Cyclohexanesab This table gives the sum of the values for the 1,3 diaxial interactions of the substituent with two hydrogen atoms. kJ/mol kcal/mol Substituent(solvent) -CH3 1.7 7.3 CH2CH3 7.5 1.8 -CH(CH3)2...
Use a Newman projection of the C3-C4 bond of 223-trimethy1-4-phenylhexane to show the most stable...
use a Newman projection of the C3-C4 bond of 223-trimethy1-4-phenylhexane to show the most stable conformation first. Rotate through all of the eclipsed and staggered conformations. Using the energy values provided in the tables below calculate the relative energies of the different conformations. Plot the changes in energy in the graph diagram providd. Hint: Draw a 2D structure first and "bold" the bond viewed in your Newman projection. vided. 2D Structure Approximate Eclipsing Energy Values (kcal/mole) H Me Et i-Pr...
Question 6 (2 points) Consider the rotation around the C2-C3 bond of 2-methylbutane. Using the values listed below, calculate the energy corresponding to (eclipsed or staggered) conformations at each 60° rotation. Define the dihedral angle (6) as the angle between the H on C2 and the methyl group on C3. Begin at the O° dihedral angle (placing C2 in front and C3 in back) and turn clockwise the front carbon. H,H eclipsing interaction = 1 kcal/mol H,CH3 eclipsing interaction =...
x Consider 2,2,3-trimethylbuttane. Using a Newman projection formula, draw the most stable conformation, sighting along the C2-C3 bond. Compute the total strain energy for this conformation. Refer to strain energy values given below. Strain energies with respect to atoms/groups bonded to C-C (one atom/group bonded to each C) H <---> H eclipsed: 4 kJ/mol CH3 <---> H eclipsed: 6 kJ/mol CH3 <----> CH3 eclipsed: 11 kJ/mol CH3 <----> CH3 gauche staggered: 3.8 kJ/mol Selected Answer: D. 7.6 kJ/mol Answers: A....
REPORT SHEET FOR CONFORMATIONAL ANALYSIS OF ALKANES AND CYCLOALKANES Ethane caMMFF Calculated Energies (kcal/mole) from Property box MMFF Energy AMI Energy (heat of 3-21GO Energy kJ/mole Compound Ethane staggered Ethane eclipsed: formation) (kJ/mole a.u Note: I a.u. (atomic unit)-I hartree 2625.5 kJ/mole For each calculation determine the energy barrier to rotation around the C-C bond in units of kJ/mole by subtracting the energy of eclipsed from the energy of staggered. (Hint: to obtain the 3-21G) value, subtract energies first, then...
In-Class Worksheet In the box below each molecule, draw Newman projections for the structures A, B, and C shown from the perspective indicated. For each Newman projection that you've drawn, indicate if there are any eclipsed bonds or 1. gauche butane interactions. H H CH3 H3C CH3 CH3 H. H3C CH3 H CH3 H H Structure C Structure B Structure A Structure A can exist in a lower energy conformation by undergoing a bond rotation; draw the Newman projection of...
I already know how to do 1 and 2. if you could show me how to do
number 3 on the graph above, and how to calculate the expected
energy of the conformer please
1 60 120 180 240 300 360 Torsion angle (degrees) AE (kcal/mol) In the box below each molecule, draw Newman projections for the structures A, B, and C shown from the perspective indicated. For each Newman projection that you've drawn, indicate if there are any eclipsed...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) A CH3...
a. Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. b. Specify substituent positions (axial or equatorial) in the more stable chair. c. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.) OH H3C...
please answer
question 5 based on the drawing probided of 2-methyl butane. please
indicate whether it is dihedral or degrees rotation
o. chemistry homework
5. Draw an energy diagram on a separate sheet of graph paper, plotting the approximate conformer energies against dihedral angles OR degrees rotation. You will have to estimate the potential energies based on your drawings. Grading for energy diagram graphs: Use an entire page in your laboratory notebook-it is graph paper Graphs must have a title...
Strain Energy Increments Strain Energy for Alkanes Interaction/Compound kJ/mol kcal/ 4.0 H: Heclipsing 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 6.3 cycloheptane 26.2 cyclooctane 40.5 9.7 Axial Strain Energies for Monosubstituted Cyclohexanesab This table gives the sum of the values for the 1,3 diaxial interactions of the substituent with two hydrogen atoms. kJ/mol kcal/mol Substituent(solvent) -CH3 1.7 7.3 CH2CH3 7.5 1.8 -CH(CH3)2...
use a Newman projection of the C3-C4 bond of 223-trimethy1-4-phenylhexane to show the most stable conformation first. Rotate through all of the eclipsed and staggered conformations. Using the energy values provided in the tables below calculate the relative energies of the different conformations. Plot the changes in energy in the graph diagram providd. Hint: Draw a 2D structure first and "bold" the bond viewed in your Newman projection. vided. 2D Structure Approximate Eclipsing Energy Values (kcal/mole) H Me Et i-Pr...
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