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- 1 (c) 2-Methyl-3-pentanol reacts with PCC to form compound F. (i) Draw the structure of F. (ii) In the mass spectrum, identify the m/z value of the molecular ion peak for compound F. (ii) Fragmentation of radical cation F exhibits two fragment ion peaks at m/z 57 and m/z 71. Propose the structures of these two fragments. (iv) Draw the resonance structure for each of the cation in (iii).Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the following compounds. (a) cyclohexyl isopropyl ether (b) tert-butyl propyl aminePlease help me analyze this 1H and 13C Acetylferrocene NMR data. I am not sure how to read the peaks and what information they give.
- The base peak in the mass spectrum of 2,2,5,5-tetramethylhexane (molecular mass = 142) is at m/z = 57, which corresponds to a composition of C4H9. Suggest a structure for the fragment that accounts for this peak and offer a reason for why this fragment is so abundant.The mass spectrum of 3-ethyl-3-methylheptane [(CH3CH2)2C(CH3)CH2CH2CH2CH3] shows fragments at m/z = 127, 113, and 85. Propose structures for the ions that give rise to these peaks(i) Give reasons, with reference to compound structures, for each of the following observations: (i) (ii) The chemical shift value for a hydrogen attached to a benzene ring is greater than 6.0 ppm while that of a hydrogen attached to an alkyne is c. 2.5 ppm. IR spectroscopy alone can clearly distinguish between trimethylamine and (iii) H-NMR clearly distinguishes between propanethiol and propanol. propanamine.
- 13. (a) A compound with molecular formula С -HаО exhibited m/z 108, 93, 78, 77, Derive the most probable 65, 51. structure.Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the followingcompounds.(a) 2-methylpentane (b) 3-methylhex-2-ene (c) 4-methylpentan-2-ol(d) 2-methyl-1-phenylpropaneIndicate two basic differences that exist between the spectra of 1H y 13C in NMR.
- Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the following compounds. (a) 4-methylpentan-2-ol (b) 2-methyl-1-phenylpropanePredict the masses and the structures of the most abundant fragments observed in the mass spectra of the following compounds. (a) acetophenone (b) 3-bromo-2-methylpentane(a) What is the molar absorptivity of compound Z at 295 nm and 348nm, given the absorption spectrum shown in Fig.22-14 (which was obtained using a UV-Vis spectrophotometer and a 1mM solution of compound Z in a sample cell with a path length of 1 cm)? (b) Now you have decided to make quantitative measurement of the level of compound Z in different solutions. Based on the above spectrum, which wavelength will you use for your measurements? Give two reasons why this is the optimum wavelength.