Practice Problems: 1. Match the following non-equivalent H's a-c with the signals in the spectrum below. HC H.C- "с...
Consider the cyclohexanol/cyclohexene mixture spectrum. Calculate the observed cyclohexanol/cylcohexene ratio. Spectrum C cyclohexene & cyclohexanol mixture solvent: CDCl 3.0 2.5 5.5 5.0 4.5 4.0 3.5 2.0 1.5 1.0 0.5 ppm Spectrum C cyclohexene & cyclohexanol mixture solvent: CDCl 3.0 2.5 5.5 5.0 4.5 4.0 3.5 2.0 1.5 1.0 0.5 ppm
8. The structure and proton NMR spectrum of a molecule are shown below. The molecule has letters by each location that has one or more protons. The chemical shifts of the signals in the spectrum are listed at right with Roman numerals. On your answer page write the Roman numeral of the chemical shift of each family on the line by that family's letta B. - A. sicer Fam., Chemical shift (ppm) 4.2 II 3.5 III 2.75 IV V 1.15...
Practice Problems: 1a. Analyze the given H NMR spectrum of 3-methyl-2-butanone. Explain why there are 3 different signals. Assign the signals to the correct H's. 3-methyl-2-butanone 1b. Do the observed splitting patterns follow the N+1 rule? Explain. .2 3.0 2.8 fi (ppm) 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0. Be very careful: it is NOT the number of H's giving rise to a signal that determines its splitting pattern. Instead, it is the number of H's...
label the spectrum OTBS Meo Yome Me H NMR spectrum (CDC13, 400 MHz) 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 f1 (ppm) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 18C NMR spectrum (CDCI, 100 MHz) 210 200 190 180 170 160 150 140 130 120 110 100 fi (ppm) 90 80 70 60 50 40 30 20 10 -10
Fill out the tables below of the starting material and pure product by using the given NMR spectrums. Identify if the pure isomer of methyl nitrobenzoate as ortho, meta, or para. Complete the table below using your proton NMR spectrum of your starting material. Be sure to include all peaks. Note: The table is expandable. Use the structure below for the letter assignments in your table. Splitting Integration Assignment Peak (ppm) Other Notes -7.95 -7.92 0627 -787 785 7.30 751...
which of the following compunds matches the soectrum given? Circle the correct answer and explain your reasoning for A, B, C, D. We did not cover this in lecture and are now encountering it in lab. Can you please tell me what the correct answers are, but also the steps to taje to solve the problem on ny own? Thank you! 2. Which of the following compounds matches the spectrum given? Circle the correct answer and explain your reasoning. ide...
Draw the structure with the mass spectrum and NMR. 151) (Mass of molecular ion: 100e-1N-7213 80 60 2 40- 20- 0 100 150 125 75 25 50 m/z Molecular Weight: 151.1195 Elemental Analysis: C, 55.63; H, 3.33; N, 9.27; O, 31.76 170 160 150 140 130 120 110 100 80 70 30 20 10 10 .5 9.0 8.5 8.0 7.5 70 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 25 2.0 1.5 10 0.5 0.0 0.5 1.0 -15 2.0 2.5...
The 1H NMR spectrum below corresponds to an unknown compound with the molecular formula C4H7Cl. Deduce and draw the structure of the molecule from the data below. Clearly show stereochemistry where applicable. 3 H H NMR 2 H 1 H (CH3)4Si 1 H 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 300-MHz H NMR spectrun ppm (o)
Propose a reasonable structure based on the molecular formula, the 'H NMR, and the proton-decoupled *C NMR data below. The unknown compound has a molecular formula of C7H160 and * = CH2 by DEPT. 'H NMR 3H 8H HC NMR 2H (CH3), Si 3.5 0.0 40 3.0 2.5 2.0 1.5 1.0 0.5 300-MHZ 'H NMR spectrum ppm (8) "C NMR spectrum ppm (5)
A variety of spectra for an organic compound with molecular formula C10H16O are presented below. The experimental accurate mass using (+) APCI source is 153.1280 u. The 1H, 13C, COSY, HSQC and HMBC NMR spectra are given in the following slides. Propose a structure for this unknown and answer or address the following questions or requirements: d. If there are still any questionable assignments, propose additional NMR experiments which would solve those questions and briefly explain specifically what correlations you...