3) Draw a cyclohexane chair with 3 substituents in the most stable conformation. Explain why the conformation you've chosen is the most stable.
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- Following is a chair conformation of cyclohexane with the carbon atoms numbered 1 through 6. (a) Draw hydrogen atoms that are above the plane of the ring on carbons 1 and 2 and below the plane of the ring on carbon 4. (b) Which of these hydrogens are equatorial? Which are axial? (c) Draw the alternative chair conformation. Which hydrogens are equatorial? Which are axial? Which are above the plane of the ring? Which are below it?Consider 1-bromo-2-methylpropane and draw the following. (a) The staggered conformation(s) of lowest energy (b) The staggered conformation(s) of highest energyFill in the blanks: cis-1,3-Dimethylcyclohexane has two different chair conformations: one withboth methyl groups in __________ positions and one with both methyl groups in ____________ positions.
- 5. Draw the two chair conformations ("ring filips") of trans –1- ethyl-4-methylcyclohexane to show the axial and equatorial substituents (including all hydrogens). Then determine which of the two conformations is more stable and why.NAME: 1. Draw the 2 chai conformations of cis-1-tert-butyl-2-ethylcyclohexane. Circle the most stable conformation of the molecule6) Draw the energetically favored (more stable) chair conformer of the following cyclohexane. H3C OH 110
- 4. Which structure below represents the most stable conformation of cis-1-t-butyl-4-methylcyclohexane? A B D 5. The planar form of which ring would have bond angles close to the tetrahedral value, but is destabilized by eclipsing interactions (torsional strain)? Which of the following statements about conformations is FALSE? A) Conformations can be isolated and separated at room temperature B) Conformations are interconverted by rotation about o-bonds C) For butane the staggered anti conformation is the most stable D) For ethane the eclipsed conformation is the least stable 6. 7. Which of the following compounds has two chirality centers? .H H. H3CThe most stable conformer of trans-1-isopropyl-3- methylcyclohexane? Select one: CH3 CH3 CH3Starting from the Newman projection below, rotate the back carbon to provide the structure in the least stable conformation. CH3 H Ø H CH3 CH3 H H H H H H
- 4. For each disubstituted cyclohexane below, draw its ring-flip isomer. Circle the most stable conformation and label the substituent groups as axial or equatorial. (a) CH3 CH; (b) (CH3)C CH3Write the two chair conformations of each of the following and in each part designate which conformation would be more stable. Why?a) trans-1-tert-butyl-3-methylcyclohexaneb) trans-1-tert-butyl-4-methylcyclohexaneDraw the structures of the two chair conformations of trans-1-tert-butyl-4-ethylcyclohexane. Which conformation is more stable? Explain your answer.