the (A) Predict the product(s) of the following synthetic transformations: (B) Name each reaction (reaction type): (C) Make sure the NMR of the final product matches your structure: 8 7 6 -5 4 3 2 1 PPM 4 0
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- Compound A undergoes an acid-catalyzed hydrolysis. One of the products (B) that is isolated gives the following 1H NMR spectrum. Identify the compounds A and CReaction 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.As we will learn in Chapter 17, reaction of (CH3)2CO with LIC≡CH followed by H2O affords compound D, which has a molecular ion in its mass spectrum at 84 and prominent absorptions in its IR spectrum at 3600−3200, 3303, 2938, and 2120 cm−1. D shows the following 1H NMR spectral data: 1.53 (singlet, 6 H), 2.37 (singlet, 1 H), and 2.43 (singlet, 1 H) ppm. What is the structure of D?
- Draw the structure of all constitutional isomers that contain a ketone and have molecular formula C5H10O. Give the IUPAC name for each isomer and state how 13C NMR spectroscopy could be used to distinguish these isomers.A solution of acetone [(CH3)2C=O] in ethanol (CH3CH2OH) in the presence of a trace of acid was allowed to stand for several days, and a new compound of molecular formula C7H16O2 was formed. The IR spectrum showed only one major peak in the functional group region around 3000 cm−1, and the 1H NMR spectrum is given here. What is the structure of the product?Predict the major organic product of each of the following reactions.
- A and B are isomeric dicarbonyl compounds of the molecular formula C5H&O2. The 'H NMR spectrum of A contains a singlet at 2.05 ppm and another singlet at 5.40 ppm. The 'H NMR spectrum of B contains three signals: a singlet at 2.3 ppm, a triplet at 1.10 ppm and a quartet at 2.70 ppm. Suggest structures for A and B and draw them in their respective boxes below. 1st attemptWhen propenal is treated with sodium acetylide, a product is formed whose IR spectrum exhibits a broad absorption between 3200 and 3600 cm¯1, but shows no absorption near 1700 cm-1. (a) Draw the structure of the product. (b) Argue whether the nucleophile adds reversibly or irreversibly to the carbonyl group. CH HC || CH2 1. HC=CNa ? 2. NH,CIA graduate student was making some 4-hydroxybutanoic acid and she obtained an excellent yield of a different compound whose 13C NMR is shown here. Propose a structure for this copound.
- Compounds A and B are isomers having the molecular formula C4H8O3. Identify A and B on the basis of their 1H NMR spectra.Compound A: δ 1.3 (3H, triplet); 3.6 (2H, quartet); 4.1 (2H, singlet); 11.1 (1H, broad singlet)Compound B: δ 2.6 (2H, triplet); 3.4 (3H, singlet); 3.7 (2H triplet); 11.3 (1H, broad singlet)As we will learn in Chapter 20, reaction of (CH3)2CO with LiC ≡ CH followed by H2O affords compound D, which has a molecular ion in its mass spectrum at 84 and prominent absorptions in its IR spectrum at 3600–3200, 3303, 2938, and 2120 cm. D shows the following 1H NMR spectral data: 1.53 (singlet, 6 H), 2.37 (singlet, 1 H), and 2.43 (singlet, 1 H) ppm. What is the structure of D?Benzoic acid, Ph-COOH (C6H5CO2H), is not soluble in water while it dissolves in ether (diethyl ether), (CH3CH2)2O. Yet upon treatment with sodium hydroxide, benzoic acid turns hydrophilic and dissolves in water. Provide chemical explanation of this observation.
