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:Q.8. Propose mechanisms for the following reactions. OH MgBr 1. 2. H* b) HO HWith 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)
- 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.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. thanksDraw structures 1 and 2. CI Zn(Hg) H 2 HCI 1. Compound 2 is an isomer of 1. 2. 'H-NMR 7.16 (m, 4H), 3.16 (1H), 2.84 (2H), 1.95 (2H), 1.26 (d, 3H). Create OscerSketch Answer 1 Provide the products of the first and second reaction. H3C Na/NH3/ELOH O3/(CH3)2S Create OscerSketch Answer 2