d. (i) Discuss the mechanism of the reaction sequence shown in Scheme 1, include all curly arrows in your answer. Br NET3 Br Ph Ph. + H-ÑEE3 + НО Ph. Br A Ph. Br + Scheme 1 (ii) Identify the functional group present in compounds A and B, Scheme 1.
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- 8. Answer both parts A and B. A: Give mechanisms for all three reactions (a-c). H,1BO/HO- (a) HO, 18ö (b) H;C H3C OH + H®OCPH; (c) Ph Ph MEOH/MeO- -Ph -Ph + Me,0 Me-O Ph Ph When MeCO2Et is heated with acid in H2180 and the reaction is quenched before it is complete, both starting material and the ethanoic acid produced are labelled with 180. Explain. B:With reference to the following reaction scheme: LIAIH4 Et,NH HCI (cat.) A C3H180 B C12H25N `Me Но HO, 1). Ph =Li HCI (cat.) 2). H3O* C C1|H2202 D C16H220 Identify compounds A-D and draw your answers in the boxes provided. Curved arrow mechanisms are not required.(C) ntify the reagen out) in Scheme 6. (D) Another repeating transformation is the reductive amination that shows up in the Schemes 3, 5 and 6. This takes Ar-NH₂ to Ar-N(CH3)2 with NaBH4/HCHO (formaldedyde). This provides the “rear" dipole that drives the nanocar. Show the mechanism for converting Ar-NH2 → Ar-N(CH3)2 with two formaldehyde molecules and NaBH4. You will need to review your notes from lab5 in chem210L that used NaBH4.
- Consider the transformation shown in Scheme 1 and answer ALL parts of the question. O (1) (a) Identify reagent X. H i. Reagent X, Et₂0 ii. H*, H₂O Scheme 1 (b) Name compounds (I) and (II). OH (11) (c) Provide a curly arrow mechanism for the transformation in Scheme 1.8. In the presence of hydroxide (OH) structure J will readily act as an acid to form structure K. HN Structure J OH Structure K + H₂O a) Show the mechanism for this reaction. Clearly show curved arrows, charges where relevant and structure K. b) Draw three resonance forms of structure K.(0) Identify and show the mechanism to form product A and B ço,CH, acid hydrolysis ČO,CH3 B.
- 4. Using arrows to show electron movements, write the stepwise mechanism for the formation of the main reaction product in the following reactions: (a) 1) CH₂MgBr, Et₂0 2) H3O+ HCI ? ? (b) O Br (Ph)3PCH₂CH₂Ph Li THF, -70 deg C to r.t. ? (c) O 1) LiAlH4, Et₂0 2) H3O+ 3) NaOH 4) CH₂ Br ?Q16. What are the necessary reagents to perform the following synthesis? Choose the answer from the options below. DG (0) CH3MgBr/ether (1) NaBH4, (2) H3O*(aq) c) H₂, Pt d) (1) CH3MgBr/ether, (2) H3O*(aq) (ii) dilute HCl(aq) conc. H₂SO4(aq) conc. H₂SO4(aq) conc. H₂SO4(aq)Draw a detailed mechanism for the reactions performed in this experiment, starting from p-vanillin and benzylamine and ending with the amine product (reductive amination of p-vanillin and benzylamine, resulting in the formation of 4-((benzylamino)methyl)-2-methoxyphenol.). plz answer in details. thanks
- Study the reaction scheme shown below and answer all sections (i) – (v) relating to it. ? EC Na* ? E Br H F Reaction of alkyne D with a strong base gave an intermediate E, which reacted with compound F to give product G. Suggest a base that could be used in this reaction, and explain why the hydrogen that is removed is unusually acidic compared to other H atoms bonded to carbon. Propose a reagent and catalyst to accomplish the conversion of compound G into alkane H.(iii) Show the structure of alkylation product Y and a detailed mechanism for its formation. Explain why NaŌEt would not be a suitable base for this reaction. MeO OMe m NaH, THF Br Y2. Propose a reasonable mechanism for the following reactions. Label each reagent's role in the reaction. Assume aqueous work up to obtain neutral products. b. Ar- HO OH Ar ZnCl₂ Ar Hint: ZnCl₂ is a Lewis Acid.