CHEM 222 Lecture Notes - Lecture 7: Atomic Number, Chch-Dt, Neopentane
28 Sep 2020
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15-n has 7 protons and 8 neutrons, 31-p has 15 protons and 16 neutrons. 2-h has 1 proton and 1 neutron, so it does not qualify: 11b, 1h, 19f, 13c: all of the above are nmr active. To achieve nmr activity, you need an odd atomic number or an odd mass number, so nuclear spin is not zero. All other nuclei are nmr active: 12c is not nmr active because it does not have a net nuclear spin. 12-c has an even number of protons and an even number of neutrons. With an even number of each sub-nuclear particle, the spins cancel out. Circled hs have the highest chemical shift, due to proximity to ewg chlorine. Circled hs have the highest chemical shift (hard to differentiate), aromatic > aliphatic. Circled hs have highest chemical shift, aromatic > alkene > aliphatic and o/p shielded by chemical resonance. Boxed c has the highest chemical shift, due to pi-system and ewg nitrogen.
