4. There are two spectra on the next page, one for each of the following compounds: BAN W с Draw a resonance structure of each compound (use the alkene electrons, and think of D as an enol ether). How could these resonance structures be used to distinguish the spectra? (Think about, in particular: a) How can the chemical shifts of the vinylic protons be used to distinguish which spectrum belongs to which compound? b) How can the chemical shift of the aliphatic (i.e. sp.) methylene group be used to distinguish which spectrum belongs to which compound?) A A www MEN CELELEEE WW YY D S Y 89 1. M W

4. There are two spectra on the next page, one for each of the following compounds: BAN W с Draw a resonance structure of each compound (use the alkene electrons, and think of D as an enol ether). How could these resonance structures be used to distinguish the spectra? (Think about, in particular: a) How can the chemical shifts of the vinylic protons be used to distinguish which spectrum belongs to which compound? b) How can the chemical shift of the aliphatic (i.e. sp.) methylene group be used to distinguish which spectrum belongs to which compound?) A A www MEN CELELEEE WW YY D S Y 89 1. M W

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Q6. Complete Table 6. i) Copy and paste (insert) the correct alternative of the structures below into the table, ii) insert expected number of different ¹H and 1³C environments expected for these compounds (Table 6: columns 2 and 3 respectively) and correctly label the ¹H and ¹³C NMR spectra below in boxes provided .CI CI Table 6: Assigning NMR spectra for aromatic Structures of disubstituted No. of expected ¹H NMR peak/s benzene compounds 1,2-dichorobenzene 1,3-dichorobenzene .CI 1,4-dichorobenzene CI compounds No. of expected ¹³℃ NMR peak/s
Counterfeit drugs are a common problem in developing regions of the world. Oftentimes, counterfeit pills are made with compounds such as lactose. A lab technician has obtained the IR spectrum shown above for a sample reported to be citalopram, an antidepressant drug. Does the IR spectrum belong to citalopram or lactose? Explain your answer by describing what feature of the IR spectrum confirms your choice and describe what feature is missing from the IR spectrum for the other compound. A. citalopram B. lactose
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A.) How many signals does the HNMR of the unknown C6H14O have? B.)Whats the ratio between the number of different hydrogens in the unknown compound C6H14O? C.)Explain splitting patterns of all the signals (in depth if possible the lecture confused me). D.)Explain the chemical shifts of the signals based upon the locations of hydrogens relative to the desheilding groups if any are present in the compound. For A. I think there are 4 signals. For B. I think the ratio is 1:1:3:9 for the hydrogens on the HNMR spectrum. For the last 2 questions (C. and D.) the lecture confused me so an in depth of how you found the answer would be greatly appreciated. Also the unknown for the attached HNMR is C6H14O.
4.Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. 5. Using the peak information listed in the tables for both structures, assign each peak to that portion of the structure that produces the peak in the NMR spectrum.
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How many NMR signals/peaks does ethanol (CH3CH2OH) have? Identify the splitting pattern of each group/peak (is it a singlet, doublet, triplet, quartet, quintet, etc.).
C. The IR and CMR spectra of compound C5H13N are shown below. a) What is its "U" value? b) What functional group is responsible for the two absorption bands in the IR spectrum at - 3388 cm1 & - 3293 cm 1? Be Specific!!! c) How many different carbon atoms are present in this compound? d) Draw a structure consistent with the spectra data, and assign each CMR signals (labeled a,b.c., on the CMR spectrum) to a particular carbon or a group of carbon's in your structure. Click on the preview or the link below to see the spectra. 259 E3 Q9C.pdf
3. For the structure shown, assign the signals to the respective hydrogen and carbon on the HNMR and CNMR spectra given below. O n R
Which one of the labeled hydrogen atoms in the given molecule will have the greatest chemical shift (furthest downfield)? م شد Ha Ho He Hd