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- a) Predict the proton spectrum chemical shift, coupling and integration of the following molecule? vanillin C8H8O3 b) Also predict its cross-peaks in COSY and 1H-13C HETCOR?What is the signal splitting pattern , the integrated value and chemical shift of the NMR spectrum below . The unknown is C8H8O21. For each set of spectral data, propose an acceptable structure that is consistent with the data. a. MS: M+ m/z=71, IR: 3340, 2960, 2870 cm-1 , 13C NMR: 47.20 (CH2), 25.64 (CH2) ppm b. MS: M+ m/z= 102, IR: 2960, 2870 cm-1, 13C NMR: 72.73 (t), 23.20 (t), 10.80 (q) ppm c. MS: M+ m/z=74, IR: 3310, 2960, 2870 cm^-1, 13C NMR: 62.44 (down), 34.86 (down), 18.98 (down), 13.88 (up) ppm (DEPT-direction) d. MS: M+ m/z=92 (M:M+2=3:1), IR: 2960, 2870 cm^-1, 13C NMR: 67.29 (C), 34.46 (CH3) ppm e. MS:M+ m/z=70, IR: 3070, 2960, 2870, 1666 cm^-1, 13C NMR: 138.92 (t), 114.26 (d), 35.96 (t), 22.17 (t), 13.59 (q) ppm f. MS: M+ m/z= 72, IR: 2960, 2870 cm^-1, 13C NMR: 31.68 (t), 29.80 (d), 22.20 (q), 11.69 (q) ppm g. MS: M+ m/z= 84, IR: 2960, 2870, 1734 cm^-1, 13C NMR: 220.16 (C), 38.30 (CH2), 23.24 (CH2) ppm h. MS:M+ m/z= 138, (M:M+2=1:1), IR: ~3010(broad), 1715 cm^-1, 13C NMR: 173.61(s), 25.21(t) ppm i. MS:M+ m/z=88, IR: 2960, 2870, 1736cm^-1, 13C NMR: 170.95 (C), 60.34 (CH2), 20.98 (CH3), 14.23 (CH3)…
- Sketch the form of the 19F-NMR spectra of a natural sample of 10BF4- and 11BF4-.Name 4 chemical chifts, their multiplicity and their assignments using the following NMR spectrum?Indicate how many different 1H-NMR signals are expected for the following molecules and describe their multiplicity (splitting).
- For each set of spectral data, propose an acceptable structure that is consistent with that data 1.. MS: M+ m/z= 84, IR: 2960, 2870, 1734 cm^-1, 13C NMR: 220.16 (C), 38.30 (CH2), 23.24 (CH2) ppm 2. MS:M+ m/z= 138, (M:M+2=1:1), IR: ~3010(broad), 1715 cm^-1, 13C NMR: 173.61(s), 25.21(t) ppm 3. MS:M+ m/z=88, IR: 2960, 2870, 1736cm^-1, 13C NMR: 170.95 (C), 60.34 (CH2), 20.98 (CH3), 14.23 (CH3) ppm 4. MS: M+ m/z=73, IR: 3410, 2960, 2870, 1668 cm^-1, 13C NMR: 171.27 (C), 26.26 (CH3), 22.87 (CH3) ppmFor each set of spectral data, propose an acceptable structure that is consistent with the data 1.. MS: M+ m/z=92 (M:M+2=3:1), IR: 2960, 2870 cm^-1, 13C NMR: 67.29 (C), 34.46 (CH3) ppm 2.. MS:M+ m/z=70, IR: 3070, 2960, 2870, 1666 cm^-1, 13C NMR: 138.92 (t), 114.26 (d), 35.96 (t), 22.17 (t), 13.59 (q) ppm 3.. MS: M+ m/z= 72, IR: 2960, 2870 cm^-1, 13C NMR: 31.68 (t), 29.80 (d), 22.20 (q), 11.69 (q) ppmWhat is the Chemical shift, multiplicity, and integration for the H-NMR signals?
- Estimate the chemical shift range expected for "ii" in the H-NMR spectrum of the molecule shown below.How could 13C NMR spectroscopy be used to distinguish among isomers X, Y, and Z?Which of the following NMR features provides the number of hydrogens? Integration Shielding Chemical shift Number of signals What is the relationship between Ksp and s for calcium fluoride? Ksp = 27s4 Ksp = s2 Ksp = 108s5 Ksp = 4s3