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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. Assign the six pertinent peaks in the infrared spectrum.
NMR Practice Problems. In the following examples, we will learn how to solve NMR practice problems step-by-step in over 100 min video solutions which is essential for organic structure determination.
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.
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).
22 cze 2000 · Interpretation of spectra is a technique that requires practice - this site provides 1 H NMR and 13 C NMR, DEPT, COSY and IR spectra of various compounds for students to interpret. Hopefully, these problems will provide a useful resource to better understand spectroscopy.
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).
Most problems contain an IR spectrum (film or KBr pellet), a 500 MHz 1 H NMR spectrum, a 125 MHz 13 C NMR spectrum, and a 70 eV electron ionization Mass Spectrum. Problems 5, 7, and 17 also include 2D NMR data (COSY, HSQC, NOESY, and HMBC).
