《有机化学》课程PPT教学课件（Organic Chemistry, William A. Price, Ph.D. PPT, La Salle University, L.G.WADE, JR., 8th Edition）Infrared（IR）spectroscopy

1-Pentene 100 1985 1417 Overtones of 993&912 39 1826 3080 sp3 C-H stretching 1465 993 2965 asymmetric CH3 2932 asymmetric CHz 2876 symmetric CH3 1643 2845 symmetric CH2 912 1-Pentene CH3CH2CH2CH=CH2 0 4000 3000 2000 1500 1000 500 wavenumber cm'1

1-Pentene

1-Dodecene 100 墓 50 蓉 H2C=CH-(CH2)oCH3 4000 3000 2000 1000 Wavenumbers(cm)

1-Dodecene

2-Methyl-1,3-butadiene (Isoprene) 100 CH2 50 2982 H3C-C-CH-CH2 4000 3000 2000 1000 Wavenumbers(cm)

2-Methyl-1,3-butadiene (Isoprene)

Terminal Alkynes are Readily Identifiable with IR wavelength (um) 2.5 3.5 4.5 5.5 8910111213141516 EC-H stretch 00 2119 H CC(CH)CH (a)1-octyne 3313 4000 3500 3000 2500 200018001600140012001000 800 600 wavenumber(cm) wavelength (um) 35 5.56 8910 111213141516 00 retch visib noC stretch -<Z6 alkane C一H CH(CH一C=C一(CHb)CH stretch (b)4-octyne 4000 3500 3000 2500 2000.18001600140012001000 800 600 wavenumber(cm)

Terminal Alkynes are Readily Identifiable with IR