McMurry indicates that the gauche conformation (60 dihedral angle) of butane results in steric strain because of repulsion between the two methyl groups (p 96).

a. Would the magnitude of this steric strain increase or decrease if the dihedral angle was increased from 60 to 65 degrees?

b. Would the magnitude of this steric strain between these two gauche methyl groups increase or decrease if the C1-C2-C3 (or C2-C3-C4) bond angle increased to more than 109.5?

Question

McMurry indicates that the gauche conformation (60 ￼ dihedral angle) of butane results in steric strain because of repulsion between the two methyl groups (p 96).

a. Would the magnitude of this steric strain increase or decrease if the dihedral angle was increased from 60 ￼ to 65 degrees?

b. Would the magnitude of this steric strain between these two gauche methyl groups increase or decrease if the C1-C2-C3 (or C2-C3-C4) bond angle increased to more than 109.5?

australopithecus · Answer

reviewing my notes one second

australopithecus · Answer

http://www.cem.msu.edu/~cem251/F96/alkane_conformations/ANGLE2.HTML this might help a little

anonymous · Answer

Thank you so much, I'm desperate

anonymous · Answer

Oh, and it's for butane.

australopithecus · Answer

This stuff isn't that hard but I'm fuzzy on this stuff so bear with me

australopithecus · Answer

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australopithecus · Answer

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australopithecus · Answer

If the bond angle increased more than 109.5 I would assume the energy would increase as 109.5 degrees is the natural configuration of an sp3 hybridized carbon

australopithecus · Answer

do you know about newman projections?

australopithecus · Answer

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you would have something like this