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- When 4-dimethylaminopyridine (DMAP) is added in catalytic amounts to acetic anhydride and an alcohol, it significantly increases the rate of ester formation. The process begins with a reaction between acetic anhydride and DMAP to form a highly reactive acetylpyridinium intermediate that is more reactive than acetic anhydride itself. Propose a mechanism for this process that includes the formation and reaction of the acetylpyridinium intermediate.Amino acids can be prepared by reaction of alkyl halides with diethyl acetamidomalonate, followed by heating the initial alkylation product with aqueous HCl. Show how you would prepare alanine, CH3CH(NH2)CO2H, one of the twenty amino acids found in proteins, and propose a mechanism for acid-catalyzed conversion of the initial alkylation product to the amino acid.The first step in the citric acid cycle of food metabolism is reaction of oxaloacetate with acetyl CoA to give citrate. Propose a mechanism, using acid or base catalysis as needed.
- The mechanism for drawing the products of ethyl acetoacetate reacting with: ethoxide followed by benzyl bromide 1) NaOEt, HOEt f) 2) H;O* 2.A variation of the acetamidomalonate synthesis can be used to synthesize threonine. The process involves the following steps: Ethoxide ion deprotonates diethyl acetamidomalonate, forming enolate anion 1; Enolate anion 1 makes a nucleophilic attack on acetaldehyde, forming tetrahedral intermediate 2; Protonation of the oxyanion forms alcohol 3; Acid hydrolysis yields dicarboxyamino alcohol 4; Decarboxylation leads to the final amino acid. Write out the mechanism on a separate sheet of paper, and then draw the structure of enolate anion 1.-N- CH20 Heat -N- НО H HO H2N Acid Ar Ar Ar Ar F Treatment of amine G with formaldehyde generated iminium ion H which undergoes formation of tricycle J via iminium ion I. Provide a reaction mechanism for this sequence.
- what pair of reagants can prepare diarylakene shownIn each of the followinq rea ctions, t he indlicated procluct is either obtained poor yretd all. Provide the case, or not at detai led explanat con why this is a U ##f0d CH, (CO, Et),ci Ne GEt, EEOH PHCH(co U Ph Br CH2 CHO + CH, Č CH2 NADEE, CHz CH CH, C CHz Et OH NaOEE () CH2 CHO t CHq Ć CHzBromobenzne + Mg/diethyl ether -> Biphenyl (byproduct) Draw the mechanism for the byproduct
- Q2/Suggest a mechanism and give name reaction for each the following reactions: 1) acetic anhydride + benzaldehyde 1) CH₂COO 2) H₂O cinnamic acid 3) H₂O/H* 2) diethylcarbonate + ethylacetate 1) CH3CH₂O diethylmalonate 2) H+19.8 Propose a mechanism. + H₂C-SMe2Complete the following reactions by supplying the structure of the substrate or major organic product/s. Identify the mechanism involved (E1, E2, SN1, SN2). KOET (a) Zaitsev Pdt. + (b) Anti-Zaitsev Pdt. ELOH Choose from the choices below: АВС DEF GHI JKL
