Draw Newman projections for the six energy maxima and minima for rotation around the C2-C3 bond
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Draw Newman projections for the six energy maxima and minima for rotation around the C2-C3 bond


5. Name the following alkanes.


6. Provide structures for the following molecules.
a) trans-iodo-4-sec-butylcyclooctane
b) 6-tert-butyl-4,5-diethyl-3,3-dimethyloctane
c) The name in b) is actually incorrect. What is proper name of the molecule you drew?

7. Label each carbon atom, nitrogen atom, and hydroxyl group as 1o, 2o, 3o, or 4o. Label each 1o, 2o, 3o carbon atom as methyl (Y), methylene (E), or methine (I).



8. Draw 2-methylpentane.

a) Draw Newman projections for the six energy maxima and minima for rotation around the C2-C3 bond.

b) Calculate the energy at each conformation. (Assume the same energies for -Et as you would for -Me.)

c) Use these values to make a graph of potential energy versus dihedral angle.

d) Label the most stable conformation.

e) Label the least stable conformation?

f) What is the barrier to rotation around the C2-C3 bond?


Hint
"The principles of naming alkanes are1.   Find & name the longest carbon chain2.   Identify& name groups attached to this long carbon chain3.   Number the chain successively (starting at the end nearest a substituent group)4.   Assign the location of each substituent group using an appropriate number and name5.   Assemble the name ( li...

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