Class notes

HNMR Spectroscopy - Organic Chemistry

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Course
CHEM 281 (CHEM281)

Institution
Simon Fraser University (SFU )

Condensed class notes from lectures about nuclear magnetic resonance (NMR). Includes mechanics and theory, identification, and degree of unsaturation.

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Uploaded on January 18, 2024
Number of pages 1
Written in 2023/2024
Type Class notes
Professor(s) David vocadlo
Contains Class 15

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-
MAGNETIC
NUCLEAR Resonance
Spectroscopy

·
I
WHA WE

VOCLEAR
KNOW ABOU ACONS

magneTre
Resource
HAS ALLOWED

Spectroscopy
FOR

BREAKTHROUGHS
is ONE of THESE
NO TEC

BREAKT
torogy
trag togof
for THE
Is - 7I
STRUCTURAL

Histo As I
DETERMINATION of

ing
HREsoltron
MOTECOLES

As Some OTHER
-

provide Molecule's compason/structure
I
it Does Idea
good
CHEMISTS Wi A a
like
rapity
Echting
X-ray .

cryserilog
Ves ,

·
THE BASIS upon WHICH NMR WORKS :

! we know tha

in Some CASES , THIS
el Mdei Have A
POSTNE
CHARGE BERg
,

THE CLEAR Arts
Composed of praxis And ver rous

3 GLRGED
VOLEi ARE
POSTNE

Change
a

CREATING MagneTr
postNE Spms On ,

o
D
m

of Aband

frgERS Rig fry
WHEN THE THE are CURLED So Tha The PONT THE SAME

man
mExre Moment . ERS N

Droectron as the Spiro The Thur wil Medicate The DrrECTron of The

miguetr
.

SPir (l)

HALf INTEGER ODD

INTEGER Even odd
NMR MEASURES FREE INDUCTION decry !
ZERO EVEN EVEN

B Sprin -z =

NOTE : Adjacen
M
hydrogen
BONdEd
E AE
AOMS ARE TO
AdjACENT AOMs
WCLEi ARE CLASSIFIED By Domic MASS And Acom Number .
NoelEi WITH And ARE THREE BONdS
Andy
from EACH OTHER
Ye Have
perfectly Spierreal Spr +
&
THE NUMBEROf
a
=
I =
ALLOWED STATES

charge
.
Spr .

Ja ExtEr ne Feld
AlgorsELY
Heelers
migrette
↳S ZI + 1 Mo

grew By
.
,
an ar 2

Bo

Wr The field parallel or .
B
Against
Or
or
, antiparallel ,
a

THE AE Between d and B States is Sma However AE

get larger
.
, we Can a

By Frid Than

usmaestranger Magnete
There dre
slightily
. more recei in & State state sorce

& STATE OS THE LOWER
Energy
-

of
Frequency Equal
WHEN Em Radiation a AE 1 CHEMICAL Shift WHERE THE RESONANCE Is On THE Os
REPORTE
The
w llEi are Exposed To To
,
some SPECTRUM .

from for A of presson
of the reclEi Are ExcrEd L To B STATE THES .
Spi-ferp Frequency is CALLED The in
part per Mulron (PPM) and MES CONSTAN

grew "Type"
.

Resource
Frequency
. As THE NUCLEi RELAT Back To

ground
STATE,
THEY EMP Ar NMR
SIGNAL
. THE THIS CAN ALSO BE AffECTED
By
:

decay Surround

SHIELDMY/DESHIELDMG
Process free induction 2 WHEN ELECTROms THE melEus also

g
Called
is .
. is

carcated produce a Smart field oppoSME THE AppliED frELd THE ELECTRONS
magnetr
TO .

H-NMR SPECTRA
Analyzing
SITELd THE from feld WHEN
Extremely
magnetic
NoclEns The Exterior .

ACOMS ARE NEARBY THEY CAN CAUSE THE ELECTRON JENSMY SHI
ELECTRONEGAINE
, TO

Compound "H
REFERENCE is TMS SiCH3 + Effectrely deShielding The redEus .

Field Electrons of Aromate

Ring
Un A
magnetic
CORNE As A

3
Rig
,
averEns

He
Go
field And Causes a
desHiElding
Si THIS CREMES Effe
Magnetic
MS O u r

idental
from Alkenes
Moy/dESHiElding
SHIELD Effects &
:
THE
Carbony

O DEPEND On THE ORIENTATION

C C
of THE
Hydrogen .
THIS Is CALLED

AlkynE
m ua
c n
n n a m
e
s o m
n oe o
enn e
Amastropy
Magnetic
- -
zu - - - - - -

-

ALKENE
3 MOLECCAR
SHIELdEd CONNECTIMY
Coupling
DESHiEldEd - MORE .
Spro-Spi occurs

doe frelds of -
magnetic Merry mechei
weak
Spirss
to . M
dOESN TELL
WHAT us :

of
AdjACENTHy
drog
THES MA Ens TO SEVERAL SMALLER PEARS THE DISTANCE BETWEEN THESE SMALLER PEAks
FEATURE of SPECTRUM
g
o
.

info ABOUT Molecule
Carbonyl

(J)
He IS THE
COUPLING
CONSTANT WHA DECREASES AS BONDS
SEPARATING
THE ACOMS INCREASES .

of
Mary Types of proons
unsaturation
Number -
How

Signals
·

3
Each

cupine OFCISATURATION : rig
of PEAk of Eselt or DECREASES
Hydrogenes
How
Inegrerow Mary
·

DEGREE
Type

SHAPE of NMR PEAR #ABY2
NeigArsoveming proxons
·

DoV 20 + 2 + N H
-Shielding/deshrelding
·
Chemiere SHifT = -
X -

⑮ ~

# of
Horogens

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