Infrared spectra hexenes

Infrared spectrum, benzaldehyde, 730 butanoic acid, 771 cyclohexane., 436 cyclohexanol, 633 cyclohexanone, 730 cyclohexene. 436 cyclohexylamine, 952 diethyl ether, 671 ethanol, 421 hexane. 424 1-hexene, 424 1-hexyne, 424 phenol, 633... 

Riddiford (1967) has isolated and identified as trans-2-hexenal the volatile compound from oak leaves which stimulates the female polyphemus moth (Antheraea polyphemus) to release her sex pheromone. The infrared spectrum showed characteristic maxima at 2700, 1680, and 1625 cm" indicative of an a,)S-unsaturated aldehyde, and a maximum at 970 cm", indicative of the trans configuration at the double bond. 

Identify the C-H out-of-plane bending vibrations in the infrared spectrum of 4- methylcyclo-hexene. What structural information can be obtained from these bands ... 

FIGURE 2.10 The infrared spectrum of 1-hexene (neat liquid, KBr plates). 

Figure 5-7. The infrared spectrum of 3-methyl-c/5-2-hexene. (Courtesy API Project 44.)...

Adsorption of hex-l-ene, a mixture of cis- and frans-hex-2-ene, and c/s-hex-3-ene on nickel—silica results in identical infrared spectra [83]. Addition of hydrogen results in an intensification of the spectrum suggesting that the initial spectrum results from dissociatively adsorbed species, a conclusion substantiated by the observation that the gas in equilibrium with the surface during the initial adsorption contains isomerised hexenes. Evacuation of the hydrogen causes a decrease in intensity and the reappearance of the initial spectrum. 

Two infrared spectra are shown, One is t3i< spectrum of cyclohexane, siid Ihe othur is the spectrum fkf cyi hexene. Identify them, aad explain your answer. 

Figure 7.24. (a) The Fourier transform infrared (FT-IR) spectrum of neat 1-hexene between two NaCl slate plates. The noisy regions of the spectrum between 4000 and 3500cmr and between 1800 and 1400cm are due to water vapor, (b) The NMR spectrum (at 300MHz) of 1-hexene in HCCl. (c) The NMR spectrum (at 75 MHz) of 1-hexene in HCClj. 

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