M6 C NMR
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State the region of the electromagnetic spectrum used in NMR?
Low energy radiowaves
What does the shift tell you in C NMR?
The type of C What it is bonded to C-X
What does the number of peaks tell you in C NMR?
The number of different C environments
State the chemical responsible for the peak at 0 ppm
TMS Tetramethylsilane
State the formula for TMS
(CH3)4Si
Explain why TMS is added to samples in NMR
Internal standard
State a use of NMR in medicine
MRI Scans
State the number of C environments
3
State the number of C environments
2
State the number of C environments
3
State the number of C environments
2
State the number of C environments
3
State the number of C environments
4
Can C NMR distinguish between these isomers?
Yes 1,2-dimethyl = 4 peaks 1,3-dimethyl = 5 peaks 1,4-dimethyl = 3 peaks
Can C NMR distinguish between these isomers?
No both 2-nitro and 3-nitro would have 7 peaks Yes for 4-nitro As this would have 5 peaks
State the number of C environments
5
State the number of C environments
2
State the number of C environments in each isomer below
C = 5 D = 5 E = 4
State the number of C environments
6
State the number of C environments
6
State the number of C environments in each of these amino acids
Isoleucine = 6 leucine = 5 tyrosine = 7