Question

2. The following IR spectra each include the structure of the corresponding compound directly on the spectrum (continued on following pages). • Based on the given structures and the information provided in Tables 8.1 and 8.2, assign as many of the major absorptions as possible directly on the spectra o indicating what type of bond O and whether it corresponds to bending or a stretching vibration. Transmittance (%) 0 + 4000 3600 3200 2000 2400 1400 1200 1000 800 600 2000 1800 1600 Wavenumber (cm)

Answer 1

2 Answers - c=c-H C- H 3300cmot stoetebing vibration, *-650- 2150 cnt, Stretching vibration at lower n ot 100 cmt - dremania mequency. stretching mono-substituted aromatic a 700, 800, gooemt. Io ye- och en ch ents • 1740cmt - ester, stretching - e- • 1000 $100 cot broader of c-o-. • 2900 cmt stretching sp3-04 • 2500 cmt co overtone. Ch ncc ucah • 1400 cant stretch -C-y stretching. • 1660-1680 cmt stretch &N of amide. Ccarbonyl) 2goocomto -CH stree a la . 1800 cmt conjugated & stretching, 1750 conta Wk Fermiresonance. 100o-goo unt strong band. Ar-c. 690umt e-c

6 C-Cth-o-C CH 1 2800 & 2900 crot sp3 GH stretching ON 1400 cm 1 1440cm -cth & -ct bends • 1100 cmt - co stretching. CEN • 2260 cmt stretch with medium intensity • 700,800 cnlos stretching mono substituted aromaticing a 1475cm Ring stretch absoopting. 516oocomt. Now in • goo.fgounts Bending mono-sub stituted aromah's sing, • 1350 cmt f amide stretching. 1600-1475 cmy a ring stretch absorptions.