chapter12

15 44 ir alcohols and amines oh 3400 to 3650 cm 1

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Unformatted text preview: 1780 cm-1 Exact absorption characteristic of type of carbonyl compound 1730 cm-1 in saturated aldehydes 1705 cm-1 in aldehydes next to double bond or aromatic ring 46 C=O in Ketones 1715 cm-1 in six-membered ring and acyclic ketones 1750 cm-1 in 5-membered ring ketones 1690 cm-1 in ketones next to a double bond or an aromatic ring C=O in Esters 1735 cm-1 in saturated esters 1715 cm-1 in esters next to aromatic ring or a double bond 47 Example Problem: Two infrared spectra are shown below. One is the spectrum of cyclohexane and the other is the spectrum of cyclohexene. Identify them, and explain your answer. What is this? What is this? 48 Table 12-1, p. 425 49 Example Problem: Two infrared spectra are shown below. One is the spectrum of cyclohexane and the other is the spectrum of cyclohexene. Identify them, and explain your answer. C-H stretch C-C stretch What is this? What is this? 50 Table 12-1, p. 425 51 Example Problem: Two infrared spectra are shown below. One is the spectrum of cyclohexane and the other is the spectrum of cyclohexene. Identify them, and explain your answer. C-H stretch C-C stretch =C-H stretch > 3000 C=C stretch ~ 1650 52 Example Problem: Two infrared spectra are shown below. One is the spectrum of cyclohexane and the other is the spectrum of cyclohexene. Identify them, and explain your answer. C-H adsorption below 3000 C-C adsorption ~1450 C=C adsorption ~ 1650 indicates alkene C-H adsorption above 300...
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This note was uploaded on 04/07/2008 for the course CHGN 222 taught by Professor Cowley during the Spring '08 term at Mines.

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