CHEM 222 Lecture Notes - Absorption Band, Aliphatic Compound, Tripe

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18 Apr 2012
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Spectral interpretation always starts at the high end because higher frequencies are easier to interpret. 1-hexene: can you determine which peaks arise from the double bond? (hint: overlay the spectrum of hexane, absorption peak around 3000, sp3 bonds c-h bond. 1-heptyne: sp bonds, well above 3000, ch stretch: very sharp, thin shape of absorption band, only triple bonds (c-c, c-n) around 2200. Heptyl cyanide: c-n tripe bond, aliphatic, nothing above 3000, characteristic peak around 2200, c-n triple bond. Toluene (methylbenzene: sp3 stretch band shorter than sp2, rare case, combination/overtone bands observed at lower frequencies, characteristic of aromatics: few sharp strong peaks around. Hexanol: aliphatic compound with terminal alcohol, very smooth peak, relatively strong and broad **shape. Hexyl amine: absorption around 3300-3400, weak and triangular peaks, *nh2, two bands; nh, one band. When you get two bands, means nh is on the same carbon (double check: c-o single bond appears around 1100.

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