O NaBH4 Synthesis #2: Select a different set of two substrates and one reagent that could be combined to prepare benzphetamine. Ph Ph. Ph NH Ph H O NaBH3CN, H* [H], NaBH CN Nucleophile
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- a OH CH2CNHCH3 T CH3 d OH CHCHNHCH3 CH3 Ephedrine can be synthesized via reductive amination plus other necessary reactions. Predict the necessary reactants and reagents that will give the intermediate and final products shown.H₂C ཏཱཏི 1 ནི OH 1. Br2, PBг3 2. H₂O H3C OH Br The a-bromination of carbonyl compounds by Br2 in acetic acid is limited to aldehydes and ketones because acids, esters, and amides don't enolize to a sufficient extent. Carboxylic acids, however, can be a-brominated by first converting the carboxylic acid to an acid bromide by treatment with PBr3. Following enolization of the acid bromide, Br2 reacts in an a-substitution reaction. Hydrolysis of the acid bromide completes the reaction. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions :0: H3C Br Br + :::OH2 Br H₂O H3C Br заCH₂CNHCH₂ CH-₁ C d OH CHCHNECH, CH₂ Ephedrine can be synthesized via reductive amination plus other necessary reactions. Predict the necessary reactants and reagents that will give the intermediate and final products shown.
- 4) Propose a synthetic pathway to prepare 2-methyl-propan-2-ol from propane. You're allowed to use any reagents you like but all the carbon atoms in your product should come from the propane. он It must be propanone otherwise the conversion would be too long.Complete the reaction scheme below. Show all reagents and intermediates. No reaction is a possible answer. 1) CH3CH2M9B CH3OH H+ (ехcess) но 2) H30*, H2O B A OCH3Following ester (methyl benzoate) was hydrolyzed in presence of an acid catalyst. This reaction produces --- and ---. OCH3 benzoic acid, ethanol benzoic acid, water acetic acid, benzene benzoic acid, methanol
- A carbamate can be prepared by treating an isocyanate with an alcohol, as shown here. This type of reaction is used to synthesize polyurethanes- polymers that have a wide variety of industrial applications, such as surface sealants, high-performance adhesives, and synthetic fibers. Propose a mechanism for this transformation. R'—ОН R. `N=C=0 R. OR' An isocyanate A carbamate (Substituted urethane) O=C21) Propose a mechanism for the following reaction. OH H20, H*Question 9 The reagent which converts a carbonyl group of a ketone into a enamine group is O CH3CH2CH2NHCH3; H CH3CH2CH2NH2; H* O CH3CH2CH2NHCH3; H3O* O CH3CH2CH2NH2; OH OLIAIH[OC(CH3)3]3