1. (4 pts) In your notes, you were given the experimental value for the chair-ch
ID: 552195 • Letter: 1
Question
1. (4 pts) In your notes, you were given the experimental value for the chair-chair interconversion of trans-1,2- dimethylcylcohexane (i.e. AG2.50 kcal/mol), and you know from your practice quiz 5 that this is 0.9 kcal/mol higher than the value calculated from the table because of a gauche butane interaction. Your text explains .+ +5.4 kcal/mol, and it breaks the value down into two methyl-hydrogen 1 ,3-diaxial interactions = +1.7 kcal/mol and one methyl-methyl interaction = +3.7 kcal/mol. Knowing this, provide a "best estimate" for Grn and identify, which conformation is more stable. CH CH tb 2l CHH 3bExplanation / Answer
1a : it has two diaxial (Me andH) interaction as it has two diaxial Me groups. But in 1b ; both Me groups are in equatorial positions and hence no diaxial interaction between Me and axial H occurs.
So; 1b is more stable than 1a as the diaxial interaction between Me and H destabilises the 1a conformer.
2a is more stable than 2b as two 1;3 -diaxial interactions between Me and H destabilises 2b.
3b is more stable than 3a according to same logic stated above.
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