Consider the steps in reductive amination of butanal with aniline under mildly acidic conditions. The structures of these compounds are shown below. 8 Draw the expected imine intermediate. Include all lone pairs and hydrogen atoms on heteroatoms.
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- Reductive amination is one of the best methods to prepare amines. However, direct alkylation with alkyl halides can be used to synthesize substituted amines. Can you identify potential problem(s) when alkylating agents are used?Primary amines can also be prepared by the reaction of an alkyl halide with azide ion, followed by catalytic hydrogenation. What advantage do this method and the Gabriel synthesis have over the synthesis of a primaryamine using an alkyl halide and ammonia?Imine formation usually occurs under mildly acidic conditions; however, no acid is addedto this reaction. What is one group present that could facilitate the necessary protontransfers for this reaction?
- Primary amines can also be prepared by the reaction of an alkyl halide with azide ion, followed by catalytic hydrogenation. What advantage do this method and the Gabriel synthesis have over the synthesis of a primary amine using an alkyl halide and ammonia?Several additional amine syntheses are effectively limited to making primary amines. The reduction of azides and nitrocompounds and the Gabriel synthesis leave the carbon chain unchanged. Formation and reduction of a nitrile adds onecarbon atom. Show how these amine syntheses can be used for the following conversions.(a) allyl bromide S allylamine (b) ethylbenzene S p@ethylaniline3 Draw the structure of the imine product that is created from the condensation of an amine and acetone. Sketch step-by-step mechanism for this reaction include any necessary arrows, intermediates, and formal charges.
- During a recent synthesis of hispidospermidin, a fungal isolate and an inhibitor of phospholipase C, the investigators employed employed a novel Friedel-Crafts acylation on a nonaromatic system (J. Am. Chem. Soc. 1998, 120, 4039-4040). The following acid chloride was treated with a Lewis acid, affording a mixture of two products, 1 and 2. Propose a plausible mechanism for the formation of compounds 1 and 2. CI AICI 进一步农 COCI 2 Part 1 Incorrect. Which of the four mechanistic steps is happening? Add curved arrow(s) to draw the first step of the mechanism. Modify the given drawing of the products as needed to show the intermediate that is formed in this step. Use the +/- tools to add/remove charges. CH₂ H St Edit Drawing H₂C H CH₂ CI Q M ΟΣ+ ELOČOET H2N EtO + ELOH Reactions of a primary or secondary amine with diethyl carbonate under controlled conditions gives a carbamic ester. Write a detailed mechanism for this reaction (shown above) which proceeds in 4 steps, including proton transfer steps. Then draw Intermediate 3 in the window provided. The mechanism is detailed as follows: Step 1: Nucleophilic attack to yield zwitterion intermediate 1. Step 2: Protonation/deprotonation (i.e. "proton transfer") of zwitterion 1 to yield intermediate 2. Step 3: Intramolecular collapse of tetrahedral center in intermediate 2 to yield charged intermediate 3. Step 4: Deprotonation of intermediate 3 to yield neutral product. You do not have to consider stereochemistry. In cases where there is more than one answer, just give one. • Do not include counter-ions, e.g., Na",I', in your answer. Do not draw organic or inorganic by-products. PWhich of the following compounds will react with methylamine to form the imine shown below?
- The following three derivatives of succinimide are anticonvulsants that have found use in the treatment of epilepsy, particularly petit mal seizures. Q. Show how this same synthetic strategy can be used to prepare ethosuximide and methsuximide.Propose mechanisms for the three imine-forming reactionsNOC XT Ph CH₂ Both primary and secondary amines add to a ß-unsaturated aldehydes and ketones to yield ß-amino aldehydes and ketones rather than the alternative imines. Under typical reaction conditions, both direct and conjugate modes of addition occur rapidly. But because the reactions are reversible, they generally proceed with thermodynamic control rather than kinetic control so the more stable conjugate addition product is often obtained to the complete exclusion of the less stable direct addition product. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions H H CH3NH₂ CH3 H-A :A Ph NHCH3 вон CH3 :A H-A 8b