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If wrong single reagent, CE = zero Incomplete single reagent (e.g. carbonate) or wrong formula (e.g.NaCO3) loses reagent mark, but mark on. For “no reaction” allow “nothing”. Different reagents. If different tests on E and F; both reagents and any follow on chemistry must be correct for first (reagent) mark.
Nuclear Magnetic Resonance (NMR) Spectroscopy is the most widely used and powerful analytical tool for structural elucidation of molecules. It is used extensively by chemists to follow the course of reactions and to properly identify the structure of molecules.
TASK 10 – Using 1H and 13C NMR together to identify compounds. The 1H and 13C NMR spectra of C5H9OCl are shown. Deduce the structure of the compound and then explain each signal. The 1H and 13C NMR spectra of C5H10O2 are shown.
13C Carbon NMR. How is it different from 1H NMR and why there is no signal splitting? What is the ppm range and how to determine the number of signals.
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.
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.
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%
