Knight karplus equation
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What is the bond angle between synperiplanar substituents
0 degrees
What is the bond angle between synclinal substituents
60
What is the bond angle between anticlinal substituents
120 degrees
What is the bond angle between antiperiplanar substituents
180 degrees
What does the 3J coupling constant mean
the coupling constant between hydrogens three bonds apart
When is the coupling constant the best
coupling constant is best when the orbital overlap is the best, so best when orbitals are in the same plane
What does the larger the 3J value mean
the larger the 3J value the better the orbital overlap
When is 3J the largest
largest when the hydrogens are antiperiplanar bond angle 180 degrees
When is 3J the smallest
3J is the smallest when the dihedral angle is 90 degrees
Which 3J is larger between synperiplanar and anitclinal
Synperiplanar
what does the size of 3J also depends on
the nature of the other substituents