Ch.15.1 Hydrogen NMR Flashcards
1
Q
How does NMR work?
A
A nucleus with an odd atomic number or atomic mass number has a nuclear spin (angular momentum)
2
Q
How can a proton be SHIELDED?
A
More electron density surrounding a nucleus
3
Q
How can a proton be DESHIELDED?
A
The presence of an electronegative atom (pulls electrons away)
4
Q
What is indicated at a signal of 0?
A
The TMS standard! Not a hydrogen of a molecule
5
Q
What is an enantiotopic proton?
A
If the molecule has a plane of reflection that makes one proton the mirror image of the other.
They appear homotopic unless in a chiral environment/solvent
6
Q
What are diastereotopic protons?
A
protons in a molecule that has 2 chiral centers
7
Q
Does the NMR pick up ring flips?
A
No, that happens too quickly, so there’s only one signal
8
Q
What causes Chemical Shift?
A
