probset8_11

probset8_11 - Chemistry 21b Problem set # 8 Out: 02Mar2011...

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Unformatted text preview: Chemistry 21b Problem set # 8 Out: 02Mar2011 Due: 09Mar2011 1. These are a suite of NMR or combined IR/NMR spectroscopy problems. From the spectra and information below, derive the molecular structure. Explain your reasoning. a). The IR spectrum below is obtained on a neat liquid sample, which shows a fairly weak UV absorption band near 280 nm in 95% ethanol. The parent mass peak in the spectrum lies at MW=86, with fragments 29 and 57 amu. b). The formula for this compound is C 6 H 12 O 2 . The IR spectrum is obtained on a neat liquid sample. What is the structure of this compound? c). The compound whose IR and NMR spectra are shown below has a parent ion peak at 60 amu and a strong fragment at 31 amu. There is no UV absorption above 205 nm. d). The compound whose IR and NMR spectra are shown below has a parent ion peak at 134 amu and a strong fragments at 91 and 43 amu. There is strong UV absorption below 200 nm, and two weak bands at 252 and 280 nm. e). There is no UV absorption by this compound at wavelengths beyond the 205 nm cutoff ine)....
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This note was uploaded on 01/03/2012 for the course CH 21b taught by Professor List during the Fall '10 term at Caltech.

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probset8_11 - Chemistry 21b Problem set # 8 Out: 02Mar2011...

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