Carbon NMR Lecture Handout

1
Ch15.1 – 13C-NMR


13
C-NMR Spectroscopy




Information from 13C NMR Techniques in 13C NMR
(1) Number of Signals (1) proton-decoupled (broad-band-decoupled) 13C NMR
(2) Chemical Shifts (δ) (2) Off-resonance-decoupled 13C NMR
(3) DEPT 13C NMR
3.1) DEPT 135
3.2) DEPT 90



23
Information 1: Number of Signals (2)
C

chemically nonequivalent carbons
Number of Signals is the Numbers of __________________________________
-




C2




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, 2
Ch15.1 – 13C-NMR


Chemically Equivalent/Nonequivalent




All S carbons
1
are the same >
-




signal

Resolves into
> C
signals four dif
-


z .




at a higher
field




↓
All Chemically
nonequivalent
n , c - H




-
1
c
All carbons are
dif now
.
Tetramethysilan
(TMS)
refrence sign
L




Just want to remind you to stay hydrated.