H NMR Flashcards
1
Q
Protons on 3-membered rings are high or low? Complex or simple coupling?
A
Complex coupling with unusually low shifts (
2
Q
Aldehyde terminal hydrogen
A
~10
3
Q
Terminal ester hydrogen
A
~8
NB less than for aldehydes; this is counterintuitive
4
Q
Benzene
A
7.3
5
Q
Attached to sp2 carbon
A
5-6
6
Q
On the -yl side of an ester next to the oxygen, amide, ether to next to chlorine
A
3-4.5
7
Q
Terminal alkyne
A
About 2-3, much lower than expected due to decreased local B field
8
Q
Alkane chain
A
About 2
9
Q
Shift in methyl groups is about __ppm less than in alkyl chains
A
0.5
