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NMR Practice Problems. NMR Practice Problem (Part II) Winter 2016. (Problems from former Chem 30BL finals) 1. Compound W has an empirical formula of C11H10O2. Given are the following spectra. Show all your work (= label peaks in the spectra!) Determine the degree of unsaturation for the compound.
Given are the following spectra. a. Determine the degree of unsaturation for the compound. b. Assign five pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Show all your work and clearly indicate what your final answer is.
Chemistry 233 Chapter 13: NMR Spectroscopy Problem Set. 1) For each compound below, identify each chemically distinct type of hydrogen. Specify the number of 1H NMR signals you would expect to see. Tips: 3) Consider the indicated protons in each of the three compounds below.
The following exercises are designed to help you become familiar with predicting the 1H NMR spectra of simple organic molecules. For each example you should find the number of signals you expect, where they should show on the scale (chemical shift), and what shape they should be (splitting patterns).
Chapter 13: Nuclear Magnetic Resonance (NMR) Spectroscopy direct observation of the H’s and C’s of a molecules Nuclei are positively charged and spin on an axis; they create a tiny magnetic field + + Not all nuclei are suitable for NMR. 1H and 13C are the most important NMR active nuclei in organic chemistry Natural Abundance 1H 99.9% 13C 1.1%
NMR Practice Problems. Tell precisely how you would use the proton NMR spectra to distinguish between the following pairs of compounds: 1-bromopropane and 2-bromopropane. propanal and propanone. ethyl acetate (MeCO2Et) and methyl propanoate (EtCO2Me) 1-butyne and 2-butyne.
Justify your assignments by use of the empirical parameters found in the appendix of the laboratory manual. Identify each 13C-NMR signal as either alkyl, vinyl, alkynyl, aryl, nitrile, imine, or carbonyl (you do not need to assign individual carbon atoms to each signal).
