Conformational analysis Flashcards
1
Q
Draw conformations of ethane
A
2
Q
which conformer of ethane is more stable and why?
A
staggered
3
Q
Draw energy profile of ethane
A
4
Q
reason of why staggered is more stable than eclipsed?
A
- the electron in filled orbitals r4epel each other and it is max for eclipsed conformation
- better stabilizing iteractions between bonding of one carbon and antibonding of another carbon. This is greatest when C-H sigma and C-H sigma star are parallel to each other. Which happens in staggered conformation
5
Q
Draw conformations of propane
A
6
Q
Draw conformation of butane and name them
A
7
Q
Draw energy profile of butane
A
8
Q
What is gauche effect
A
9
Q
On what factors does gauche effect depend?
A
donor ability increases as electronegativity decreases
donor ability increases as we go down the group
lone pair > bonding pair
10
Q
Draw cyclopropane and write about it
A
11
Q
draw cyclobutane and write about it
A
12
Q
Draw cyclopentane and write about it
A
13
Q
draw newmans structure for cyclobutane
A
14
Q
draw newmans structure for cyclopentane
A
15
Q
Draw energy profile for cyclohexane
A
