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- Compound b is a derivative of compound a. Comparing ¹H NMR of a and b, we found that two signals shown in compound a move to downfield around 7.38 ppm and 8.42 ppm in compound b. Identify the two protons that most likely give rise to these signals and justify your decision. (3 pts) (a) Ĵ (b)11. (a) Compound A with molecular formula C10H17NO has the following 'H NMR spectra. Identify the compound and assign & values for each proton. PPM(3) These natural compounds will have different numbers of 1H-NMR signals in different NMR solvents like CDC13 and methanol-d4. How many signals do you anticipate for each compound respectively in CDC13 and methanol-d4? LOCH 3 OHC. vanillin OH LOH acetoaminophen HO thymol
- (a) Rank each proton shown below in terms of relative chemical shift in the ¹H NMR spectrum. (1 = most upfield, 3 = most downfield) (i) (iii) H JO [ Ⓒ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 clearlyUse the NMR tables & to predict the range (ppm) where each compound should absorb.
- (c) Assign the correct structure for compound M with molecular formula C5H100, which has 'H-NMR signal at 8 = 5-64 (A), 5:53 (B), 4-23 (C), 1-92 (D), (D)is an exchangable singlet (with D20). . multiplets, (Ẹ) and (F) are doublets and a E 1:68 (E) and 1-24 (F)" in рpm. JAR = 16:3 Hz. (A), (B)_ and (C) are (A), TB). and (C) arePredict the theoretical number of different NMR signals produced by each compound, and give approximate chemical shifts. Point out any diastereotopic relationships. (a) Ph¬CHBr¬CH2Br (b) vinyl chlorideWhat is the H nmr of the following compound? Please be neat and explain properly. (HO)₂B.
- How could 1H NMR spectroscopy be used to distinguish among isomers A, B, and C?How could IR spectroscopy be used to distinguish between the following pairs of compounds? (a) HOCH2CH2CHO and CH3CH2CO2H (b) CH3CH2OH and CH3OCH3 (c) A 1o amide and a 1o amineWhich of the following compounds is consistent with the ¹H NMR spectrum shown below? 7 1H dd (A) 1H 1H dd dd 6 (B) ppm 5 (C) ★ 3H S (D)