PQ-13. An unknown reacts with PCC and gives this 'H NMR spectrum. Which structure is consistent with this data? (A) 5 is (B) H 3 2 PPM OH OH (D)
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- Reaction of p-cresol with two equivalents of 2-methylprop-1-ene affordsBHT, a preservative with molecular formula C15H24O. BHT gives thefollowing 1H NMR spectral data: 1.4 (singlet, 18 H), 2.27 (singlet, 3 H), 5.0(singlet, 1 H), and 7.0 (singlet, 2 H) ppm. What is the structure of BHT?Draw a stepwise mechanism illustrating how it is formed.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).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?
- Anethole, C10H12O, a major constituent of the oil of anise, has the 1H NMR spectrum shown. On oxidation with Na2Cr2O7, anethole yields p-methoxybenzoic acid. What is the structure of anethole? Assign all peaks in the NMR spectrum, and account for the observed splitting patterns.Addition of m-xylene to the strongly acidic solvent HF/SbF5 at 45C gives a new species, which shows 1H-NMR resonances at 2.88 (3H), 3.00 (3H), 4.67 (2H), 7.93 (1H), 7.83 (1H), and 8.68 (1H). Assign a structure to the species giving this spectrum.Acid-catalyzed hydrolysis of HOCH2CH2C(CH3)2CN forms compound A (C6H10O2). A shows a strong peak in its IR spectrum at 1770 cm-1 and the following signals in its 1H NMR spectrum: 1.27 (singlet, 6 H), 2.12 (triplet, 2 H), and 4.26 (triplet, 2 H) ppm. Draw the structure for A and give a stepwise mechanism that accounts for its formation.
- Reaction of p-cresol with two equivalents of 2-methylprop-1-ene affords BHT, a preservative with molecular formula C15H24O. BHT gives the following 1H NMR spectral data: 1.4 (singlet, 18 H), 2.27 (singlet, 3 H), 5.0 (singlet, 1 H), and 7.0 (singlet, 2 H) ppm. What is the structure of BHT? Draw a stepwise mechanism illustrating how it is formed.Deduce the identity of the following compound from the spectral data given. C8H10: 1H NMR, 6 1.20 (3H, triplet), 2.60 (2H, quartet), 7.12 (5H, singlet) (ppm); IR, 3050, 2970, 1600 cm-1; MS, m/z 912. The following synthesis was planned. The 'H NMR spectrum of the final product was run and is presented below. Was the synthesis successful? If not, what is the actual product and why? sos H2N' 10 로 1H 2H 2H 8 1. NaNO2 HCI (aq.) 2H 2H 6 2. H 1H 1H PPM 1H OH 1H HO 2
- Provide a structure for the given compound. molecular mass 101; -1. IR: 3397, 3200, 1655, 1622 cm¯¹; 13C NMR: 8 27.5, 838.0 (weak), 8 180.5 (weak). Draw the compound. Select / ||1||| Draw C H N Templates O MoreTreatment of 1-pentene with H2SO4/H2O gave product D. The MS spectrums of Compound D is shown below. Note that the molecular ion, m/z 88 is not detected in the spectrum. Identify the structure of product D. Provide explanation for your answer.(b) The 1H-NMR spectrum of compound B, C5 H10 O2, consists of the following signals: 8 1.2 (d, 6H), 2.0 (s, 3H), and 5 (septet, 1H); contains an ester. Draw the structural formula of compound B. • You do not have to consider stereochemistry. • Explicitly draw all H atoms. ୫) C n ? ChemDoodle ® Show Hint