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- Consider carbons x, y, and z in p-methylanisole. One has a chemical shift of δ 20, another has δ 55, and the third δ 157. Match the chemical shifts with the appropriate carbons.Which of the following produces a positive peak in a DEPT-135 spectrum? A) CH B) Quaternary Carbon Atoms C) CH4 D) CH2Hpw do you determine whether or not carbons are equivalent in C13 NMR explain with example in detai...
- Which occurs at a larger wavenumber: a. the C - O stretch of phenol or the C - O stretch of cyclohexanol? b. the C - O stretch of a ketone or the C - O stretch of an amide? c. the C - N stretch of cyclohexylamine or the C - N stretch of aniline?a) what bond is present in ketones but not alkanes? b) what is the wavenumber range of the signals that are present in the diagnostic region of all of the ketone IR spectra (but not the alkanes)? c) is the new band strong or weak compared with a C=C or a C≡C stretch?The carbon NMR chemical shifts of diethylmethylamine, piperidine, propan-1-ol, andpropanal follow. Determine which spectrum corresponds to each structure, and showwhich carbon atom(s) are responsible for each absorption.12.4, 41.0, 51.1
- 4 Which of these C6H14 isomers has the greatest number of ¹3C NMR signals? (a) Hexane (d) 2,2- (b) Dimethylbutane 2-Methylpentane X3-Methylpentane (e) 2.3- DimethylbutanePredict the theoretical number of different NMR signals produced by each compound,and give approximate chemical shifts. Point out any diastereotopic relationships. Ph¬CHBr¬CH2BrComplete the table with at least 3 Major NMR shifts (stilbene). Please don't use abbreviations.
- Show which carbon atoms correspond with which peaks in the 13C NMR spectrum ofbutan-2-one2) Compound C gave the following proton NMR signals: a) singlet,1.22 ppm, 6H; b) Triplet, 1.85 ppm, 2H, J = 7 Hz; c) triplet, 2.83 ppm, 2H, J = 7 Hz; d) singlet, 7.02 ppm, 4H. Sketch the proton NMR spectrum of compound C and assign the chemical shifts to the protons of the compounds.6 I have to answer the following questions relating to the attached HNMR spectrum. a. Match the hydrogens in dibenzalacetone to the signals in the spectrum. b. Does this sample also contain any benzaldehyde? c. Does this sample also contain any other impurities?
