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Material Type: Notes; Class: Introduction to Organic Chemistry; Subject: Chemistry; University: Wake Forest University; Term: Unknown 1989;
Typology: Study notes
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IR Spectroscopy by Functional Group Alkanes Indentification of absorbance Wavenumbers, cm- sp 3 C-H stretch 2960-2850 (<3000) Alkenes sp 2 C-H stretch 3100-3020 cm
(aliphatic) 2240-2222 cm
(conjugated) Alcohols O-H stretch 3600-3200 cm
(strong and broad) C-O stretch 1150-1050 cm- Aromatic Compounds sp^2 C-H stretch 3100-3020 cm-1^ (>3000) C=C stretch ~ 1585 cm- Aromatic overtones of ring bends 2000-1667 cm- Aromatic out-of-plane ring bends ~ 900-700 cm
(see p. 519) Amines N-H stretch 3500-3350 cm
(aliphatic) 1342-1266 cm-1^ (aromatic) Aldehydes C-H stretch of -CHO 2830-2695 cm- C=O stretch 1740-1720 cm
Ketones C=O stretch 1750-1710 cm
(1715 is typical for aliphatic ketones) 1685-1665 cm
(conjugated) Carboxylic acids O-H of –CO 2 H 3600-2500 cm
(centered at ~ 3000) C=O stretch 1720-1710 cm
(conjugated) Esters C=O stretch 1750-1735 cm
(conjugated) C-O stretch 1300-1000 cm-