13C-NMR Flashcards

1
Q

CH3

A

5-30

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2
Q

CH2

A

20-40

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3
Q

CH

A

32-60

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4
Q

HC-O

A

62-80

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5
Q

C (quart)

A

30-50

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6
Q

C-O

A

72-85

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7
Q

C-dreifach-C

A

75-93

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8
Q

Benzol

A

111-135

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9
Q

C=C

A

105-143

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10
Q

COOR

A

160-175

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11
Q

COOH

A

170-185

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12
Q

CHO (Aldehyd)

A

180-205

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13
Q

C=O (Keton)

A

200-225

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14
Q

Einfluss durch Alkylsubstitution

A

Tieffeldverschiebung

CH4 < CH3 < CH2 < CH < C

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15
Q

y-Effekt

A

Hochfeldverschiebung für alpha beta gamma bei:
OH
SH
Br

mit substituierten höhere werte als ohne, nimmt von alpha zu beta zu gamma ab, danach aber wieder zu !!! (CH3 niedriger wieder und CH2 an CH3 auch bisschen niedriger aber eher an CH2 davor als an CH3)

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16
Q

Einfluss des pH-Wertes

A

bei amphoteren AS nimmt der wert mit steigendem pH zu

17
Q

Einfluss der Ladungsdichte

A

Erhöhte Elektronendichte –> erhöhte Abschirmung –> Hochfeldverschiebung