ds5_enonce

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Devoir Surveillé n° 5!
le!jeudi!16!mars!2017!
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&&EXERCICE&2&:&&&&&&&&&&&&&&&&&&&15!min&
R.M.N&
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Protons
δ (ppm)
Protons
δ (ppm)
(CH3)4Si
(référence)
0
-CH-O-
3,5 – 4,5
-C-CH3
0,8 – 1
-O-H (alcool)
1 – 6 (large)
-C-CH2-C-
1,3 – 1,5
-CH=CH-
5,0 – 6,8
-CH-C=C-
1,6 – 2,2
-CHO (aldéhyde)
9,5 – 9,9
-CH-C(O)-
2,5 – 2,7
-CO2H
10,5 – 12,5
TABLEAU 1 - Table de déplacements chimiques en RMN-1H!
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protons
δ (ppm)
multiplicité
intégration
H1
0,01
singulet
6 H
H2
0,83
singulet
6 H
H3
0,88
singulet
9 H
H4
1,21 – 1,29
triplet
2 H
H5
1,41
singulet
1 H (large)
H6
1,46 – 1,58
multiplet
2 H
H7
3,24
singulet
2 H
H8
3,61
triplet
2 H
TABLEAU 2
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&&EXERCICE&3&&&&&&&&&&&&&&&&&30!min&
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(-)-Menthol Synthesis from (-)-beta-Pinene
J.P Bain, R.L. Webb & B.J. Kane!
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