NMR Group Assignment
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Transcript of NMR Group Assignment
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LOGO GROUP PRESENTATION PROJECT FOR
STKK 6014: Nuclear Magnetic Resonance Spectroscopy (NMR)
Proton and Carbon NMR Elucidation for Compounds
Extracted from styrax benzoin (styracaceae)
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Contents
Introduction1
Proton NMR2
Carbon NMR3
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Introduction
Compounds from styrax benzoin (styracaceae) Styrax species contain egonol (natural
benzofuran)- an effective pyrethrum synergist. (Takanashi & Takizawa, 1988)
The elucidation is done by using NMR 600MHz with deuterated chloroform (CDCl3) as solvent.
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1H NMR
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Proton NMR (solvent:CDCl3)
H3H2
H2
H3
CHCl3
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Proton NMR
OCH 3
H1
OCH 3
H1
H3H2
CHCl3
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H3(2H,t) n=2J=7.8 Hz
OCH 3
(3H,s) n=0
H1(2H,t) n=2J=6.0 Hz
H2(2H,p) n=4
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H15
H9
H10
H5
H17
H5
H17,J=7.8 Hz
H10
H9
H2H3
H1
OCH3
CHCl3
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H15
H9
H10
H18
H13 H5
H18, J= 7.8,1.8 Hz
H13, J=1.8 HzCHCl3
H17
OCH3
H1
H3H2
H18
H17,J=7.8 Hz
H5
H10
H9
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13C NMR
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C2
C3
C1C15
C12
C10 O-Me
C11
C-14
C-16
C8
C-7
C4
C6
C17C9
C5
C18
C13
CDCl3
Upward signals: CH2 and C4
Downward signals: CH and CH3
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C2
C3
O-Me
C1
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C15
C10
C13
C9C17 C5
C18
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C12
C6
C4
C-7
C8C-14
C-16
C11
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LOGO