IR spectroscopy lset etawert awertarweec 10 (1).pptx

IR spectroscopy lset etawert awertarweec 10 (1).pptx

1. Carboxylic acid C–O Stretch 1320–1210 medium O–H out-of-plane bending: ~930–950 cm⁻¹ (less intense)

2. The infrared spectrum of 2- methyl propanoic acid

3. The infrared spectrum of benzoic acid

4. Esters

5. The infrared spectrum of ethyl butanoate

6. The infrared spectrum of vinyl acetate

7. The infrared spectrum of methyl benzoate

8. Amides

9. The infrared spectrum of propionamide

10. The infrared spectrum of N- methylacetamide

11. Acid halides C=O Stretch ( Unconjugated ) 1810–1775 cm−1 C=O Stretch (Conjugated) 1780–1760 cm−1 C– Cl Stretch 730–550 cm−1 Look for a strong sharp peak multiple bands possible below 750 cm⁻¹ in a compound that also shows a C=O stretch around 1810–1775 cm⁻¹ — together, these strongly suggest an acid chloride

12. The infrared spectrum of acetyl chloride

13. The infrared spectrum of benzoyl chloride

14. Acid anhydrides Types of vibrations bands/peaks Wavenumber (cm⁻¹) C=O Stretch (asymmetric) 1 st band 1830–1800 cm⁻¹ C=O Stretch (symmetric) 2 nd band 1775–1740 cm⁻¹ C–O Stretch multiple bands 1300–900 cm⁻¹

15. The infrared spectrum of propionic anhydride