Account for the presence of peaks at mlz 135 and 107 in the mass spectrum of 4-me- thoxybenzoic acid (p-anisic acid). H,CO- -COH 4-Methoxybenzoic acid
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- G.5 Mass spectra were acquired for 1,4-diethylbenzene and 1-methyl-4- propylbenzene. The base peak of spectrum A is at m/z = 105 and that of spectrum B is at mlz = 119. Match each spectrum to its compound.QUESTION 3 Predict the IR absorption bands (peaks) observed in the spectrum of 3-methylcyclohexanone. sp3 C-H stretching (-2850-2960 cm 1) sp2 C-H stretching (-3000-3100 cm-1) Alcohol O-H stretch (-3300 cm-1, broad) C-O double bond stretch (-1700 cm-1) Aromatic out of plane bend for monosubstitution (690-710 and 730-770 cm-1). Aromatic out of plane bend for para (1,4) disubstitution (810-840 cm-1). Aromatic out of plane bend for meta (1,3) disubstitution (690-750 and 750-810 cm 1). Aldehyde C-H stretch (2750 and 2850 cm-1). Carboxylic acid (carboxy group) O-H stretch (-2500-3000 cm-1, broad) N-H stretch (2 bands at -3400 cm-1) N-H bend (-1600 cm*1) Aromatic C-C double bond stretches (-1500 and 1600 cm-1). Aromatic overtones (1667-2000 cm-1) O O O OQ.3. The low resolution mass spectrum of 3-methyl-3-pentanol (see its structure below) shows m/z peaks at 102, 87, 84, and 73. Propose the structures of these peaks. OH
- 1H NMR Spectroscopy Spectra run at 60 MHz 70 SPECI 4 50 30 20 Explain the main features of the 1 H NMR spectrum of crotonic acid (4), Spec. 4. Deduce the stereochemistry of the carboxylic acid (CO2H peak not shown).A low-resolution mass spectrum of 2-methyl-2-butanol (MW 88) shows 16 peaks. The molecular ion is absent. Account for the formation of peaks at m/z 73, 70, 59, and 55 and propose a structural formula for each cation.Annotate the Mass Spec, 1H NMR, and 13C NMR for C4H11N or Butylamine Annotate the Mass Spec, 1H NMR, and 13C NMR for C4H8O or Butraldehyde Annotate the Mass Spec, 1H NMR, and 13C NMR for C5H8O or Cyclopentanone Thanks :)
- 3-Chlorocyclopropene, on treatment with AgBF4, gives a precipitate of AgCl and a stable solution of a product that shows a single 1H NMR absorption at 11.04 δ. What is a likely structure for the products, and what is its relation to HĂ¼ckel’s rule?The following two mass spectra represent 1-bromo-4-ethylbenzene and (1-bromoethyl)benzene, respectively. 100 - MS-IU-9451 Spectrum 1 80 - 60 40 20 - 25 50 75 100 125 150 175 m/z 100 - MS-NU-8350 Spectrum 2 80 - 60 20- 20 40 60 80 100 120 140 160 180 200 m/z 1. Assign each spectrum to one compound 2. Justify your assignment by assigning relevant signals in each spectrum. 3. Explain how you could determine which spectrum belongs to which compound. Relative Intensity Relative IntensityWhen 1-bromobutane is treated with sodium acetate (CH3CO,Na), the major product for the reaction is an ester (CH;CO2CH2CH2CH2CH3). Explain how mass spectrometry and IR spectroscopy could be used to prove that the reaction has occurred and you no longer have the starting material.
- Q1. How will you distinguish the two members of each of the following pairs of compounds using IR spectroscopy: (a) CH;COOH and HCOOCH; (b) B-propiolactone and y-butyrolactone (c) CICH,CH,CH;COOH and CH;OCH,CH,COCI (d) CH,CH,CHO and CH,=CH-CH,OH please explain each clearlyThe mass spectrum of an unknown compound is presented below. The 'H NMR spectrum of this compound contains only of a large doublet and a small septet. Which of the following choices represents the structure of the compound? m/z Intensity 27 34 39 11 41 22 43 100 (base) 63 26 65 8 78 24 M+. 79 0.8 80 A. C3H1002 В. СЭН,СI С. СЭН,Br D. C2H;OCI E. C;H14N2Account for the formation of the base peaks in these mass spectra. Q.) Isobutylmethylamine, m/z 44