View
235
Download
0
Category
Tags:
Preview:
Citation preview
NMR Practice: C4H10OGiven a molecular formula and an NMR spectrum, what is the structure of the compound?
2 H
3 H
NMR Practice – C6H12O2
integral
ratio 1 : 3.0
NMR : C4H8O2
8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00
q t
3 H2 H3 H
Common Patters for Proton NMR
1. triplet (3H) + quartet (2H)
2. large double (6H) + muliplet
3. large singlet (9H), ~1 ppm
4. multiplet ~7.2 ppm (4-5H)
5. singlet 3.5 ppm (3H)
6. singlet 2.1 ppm (3H)
ethyl group
isopropyl
t-butyl group
aromatic ring
-OCH3 group
H3C-C=O
(methyl ketone)
NMR Spectrometer - schematic
6
C4H7ClO2
NMR : C10H14
4 Hm
6 Hd
3 Hs
1 Hm
9
1H NMR : C6H12
10
1H NMR : C5H12O
(doublet)
br
11
1H NMR : C5H10O
1H NMR : C9H10
3 H doubletJ = 8 Hz
1H 1H
3H 2H
11 Hz
Recommended