Proton NMR Flashcards
(12 cards)
1
Q
In methyl groups vs in alkyl chains
A
0.5 less
2
Q
Three membered ring
A
Very low
3
Q
On carbon connected to double bond
A
2.5
4
Q
On carbon connected to O vs connected to N
A
~1 greater
5
Q
Conjugation
A
Increases shift
6
Q
Aldehyde vs formate ester
A
Aldehyde greater
7
Q
Aromatic ring vs alkene vs alkyne
A
Aromatic>alkene»alkyne
Due to local magnetic fields
8
Q
Coupling to spins>1/2
A
Not often observed as spin states rapidly interconvert
9
Q
Carboxylic acid
A
10-12
10
Q
Aldehyde
A
9-10
11
Q
Benzene
A
6-8
12
Q
Proton bonded to O or N
A
Anywhere- always a singlet
