Identify the structure and assign peaRS and J values for an organic compound C4H3O with p-NMR (CDC1,3, 400 MHz- 300 K) values at 8=1.01 (t), 1.56 (m). 2.47 (m), 2.73 (m), Rluu =2:7Hz, 3JHH = 4.0 Hz. 2.88 (m).
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- How could 13C NMR spectroscopy be used to distinguish among isomers X, Y, and Z?Calculate the HDI of each FM and propose 2structures for two molecules that are isomers.Specify what the indicated absorption (s) shouldbe to.a.C7H15NO with strong absorptions in 3400, 3270and 1670, 1390, and 1370 cm-1b. C6H10O with absorptions in 2065 (m), 1685 (f),1650 (m) and 970 (f) cm-1c. C9H12O, with absorptions in 1600 and 1500 and1245 cm-1.What is the NMR Spectra for C6H10O2 and what is the chemical formula for the compund?
- The 1H NMR spectrum of chloromethane recorded on a 300 Hz NMR spectrometer consists of signals at 444 Hz and 1071 Hz downfield from TMS. Calculate the chemical shift of each absorption. Give answer in parts per million.What characteristics of the methyl benzoate spectrum rule out an aldehyde or carboxylicacid functional group giving the absorption at 1723 cm-1?What functional group can you get from its IR spectrum? Support your answer by identifying prominent peaks (wavenumbers cm^-1) and assigning the functional group.
- For each set of spectral data, propose an acceptable structure that is consistent with that data 1.. MS: M+ m/z= 84, IR: 2960, 2870, 1734 cm^-1, 13C NMR: 220.16 (C), 38.30 (CH2), 23.24 (CH2) ppm 2. MS:M+ m/z= 138, (M:M+2=1:1), IR: ~3010(broad), 1715 cm^-1, 13C NMR: 173.61(s), 25.21(t) ppm 3. MS:M+ m/z=88, IR: 2960, 2870, 1736cm^-1, 13C NMR: 170.95 (C), 60.34 (CH2), 20.98 (CH3), 14.23 (CH3) ppm 4. MS: M+ m/z=73, IR: 3410, 2960, 2870, 1668 cm^-1, 13C NMR: 171.27 (C), 26.26 (CH3), 22.87 (CH3) ppmThe molecular ion region of the spectrum of biphenyl. M1 is observed at m/z 154 and the intensity of M 1 1 is 12.9% of M1. What formulas of the type CnHxOyNz are consistent with the spectrum?The 13C NMR spectrum of fluoroethanoic acid shows a multiplet centred at δ = 79. When the same spectrum is recorded using proton decoupling, the multiplet collapses to a doublet with a splitting of 160 Hz. Another multiplet, but with much smaller splittings, is also seen centred at δ =179; this multiplet collapses to a doublet when decoupling is used. Explain these observations.
- An oxygen-containing compound shows an absorption band at ~1700 cm-1 and no absorption bands at ~3300 cm-1, ~2700 cm-1 , or ~1100 cm-1 . What class of compound is it?Predict and explain the proton NMR of Butanol and 2-chlorobutane. Identify the most prominent differences.How 1H or 13C chemical shifts could be used to distinguish among the following sets of structures?