24. An NMR spectrometer that operates at a frequency of 60 MHz for 13C NMR spectra. The instrument operates at what frequency for 1H NMR spectra? A) 15 MHz B) 30 MHz C) 60 MHz D) 120 MHz E) 240 MHz
13C
NMR of the product (4) ??
Careful analysis of the 'H NMR and IR spectral data indi- cates that the product of the reaction is the isobenzofuranone derivative 4 (eq 1). toluene, A (1) Y COH PAA 200 150) 11001 100 50 200 150 100
Predict the number of 13C NMR resonances in the aromatic region of the 13C NMR spectrum of isopropylbenzene and n-propylbenzene.
13C NMR 1. Propose a structure for the compound CsH12, with the following 13C NMR spectral data. 160 140 120 80 60 40 20 0 200 180 CDS-00-748 100 ppm 2. Propose a structure for the compound CaH;Br, with the following C NMR spectral data. 200 180 160 140 120 80 60 40 100 ppm 20 0 3. Propose a structure for the compound C H2O2, with the following "'C NMR spectral data. 200 180 160 140 120 30600 T...
nmr and IR
b. Mass spectrometry indicates presence of bromine 13C NMR spectra 50 100 200 150 1H NMR spectra 4.0 10 (ppm) Download al
2. The 13C NMR spectrum is shown below for the major product of the following reaction. Draw the structure of this product. Note that there is an important peak at ca. 166 ppm and that the peak at ca. 40 ppm is due to a contaminant. excess KMnO4 H H. aq. NaOH 200 180 100 80 40 20 160 140 120 60
using the IR, the 13C, and DEPT NMR spectra of your product
determine the identity of your unknown ester from a C-4 or C-5
alcohol. the identity of the C-4 or C-5 alcohol also needs to be
determined.
The following C-4 or C-5 alcohols will be used in this
experiment:
1-butanol (n-butyl alcohol)
2-butanol (sec-butyl alcohol)
2-methyl-1-propanol (isobutyl alcohol)
3-methyl-1-butanol (isopentyl alcohol)
1-pentanol (n-pentyl alcohol)
2-pentanol
3-pentanol
cyclopentanol
Questions:
1. Why is the mixture extracted with aqueous sodium
bicarbonate solution?...
Assume you obtained 13C NMR spectra for the maleic anhydride and
the final product. By comparing the two spectrums, provide evidence
for the presence of Diels Alder cycloadduct.
1. Briefly describe the evidence you have to support that your final product is pure? 2. Assume you obtained C NMR spectra for the maleic anhydride and the final product. By comparing the two spectrums, provide evidence for the presence of Diels Alder cycloadduct. 3. What starting materials would be necessary to...
5. How many 13C NMR signals (peaks) does each compound exhibit? ed 6. The 13C NMR spectra for the following compounds are shown below. Please assign each signal to its corresponding carbon (label them a-h). 40 20 20 PPM 50 PPM
My real question is what is the relationship between 13C NMR
and the resonances of 13C ? Like how can you tell just by looking
at the molecular structure ?
I. How many PC resonances should be seen in the NMR of each of the C12H16 isomers below? CH(CH3)2 CH CH. CH(CH32# 13C peaks 13 peaks 13C peaks 13C peaks