(4) 2. Write the structure of the key intermediate and the product (with correct stereochemistry) for reaction of N-Bromosuccinimide (NBS) with cyclopentene in aqueous DMSO BromosuCcinir су NBS DMSO H,O Intermediate Product
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I got the answer but I just want to check if i got it right. Can you show the mechanism?
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- nswer all parts of this question. 3 CH3I NaOH solution NH2 [7] (11) (i) AGOH (replaces I with "OH) (ii) 180 °C [8] (14) (12) (13) 95% 5% Provide a detailed mechanism to account for the formation of the product (11) in reaction [7]. You may omit the reaction with the third equivalent methyl iodide (as it is a repeat).Draw the organic products formed in each of the following reactions. (i). (ii) (iii) (iv) (v) CI +:C=C-H + H₂O CH₂C=CCH₂CH3 HgSO4, H₂SO4 Na, NH3 2 equiv Br₂ (1) Sia₂BH.THF (2) H₂O₂ NaOH7B. (2 reactions (should clearly indicate the stereochemistry). Draw the structure of the product, substrate or condition in the following (a) ОН (b) Ме 1) OsO4 2) NaHSO3 (c) 1) (sia)2BH 2) NaOH/H2O2 H20
- Explain the E2 mechanism (bimolecular elimination) of of Elimination ?(a) Aniline is oxidized and then resulting product is boiled with Conc. HNO3 and conc. H2S04. (b) Cyclopentylnitrile is reduced with LIAIH4 and the resulting product reacts with benzenesulphonylchloride (c) 2-Chloro-5-methyl-diethylhexandioate is condensed in alkaline medium (d) 2-Methylethylpropanoate is condensed with phenylbenzanoate in an alkaline medium (e) When Ethanoic is heated with NH3 and resulting product reacts with benzoylchloride.Q4. Stabilized enolates and their surrogates. (a) Complete the following FOUR reaction schemes by drawing structures for the relevant stabilized enol, enolate or surrogate intermediates (A to D), and for the eventual organic products (E to H). (i) (ii) (iii) (iv) EtO CHO Me,SICI, Et N NaOEt EtOH HCO₂Et, NaOEt EtOH (i) t-BuNH, molecular sieves (ii) LDA A B C D MeBr, TICI 1. NaH 2. Mel 1. NaH 2. RBr 1. Me,SICI 2. RCHO, CsF E F G H
- Which diastereomer A or B gives C. Select between diastereomer A or B. Give the reaction mechanism with suitable explanation.(b) Answer all parts (1) – (). The carbohydrate J forms a six-membered cyclic hemiacetal K that predominates at equilibrium in aqueous solution. но он он = K cyclic hemiacetal ) Assign Ror S configurations to the stereogenic centres in J. (#) Draw the structure for the cyclic hemiacetal K. (i) Using curly arrows show the reaction mechanism for the formation of K.8. (6) Deduce the identity of the following compound from the IH NMR data given and IR data. C6H8O4: ¿ 3.9 (6H, singlet), 6.1 (2H, singlet) (ppm) IR: 3100 cm', 2950 cm', 1735 cm'
- 5.40. Give plausible products (or just one product) for each of the following reactions, or tell if no reaction is expected. (a) PDSO, + MgS > (b) (CH,),Hg + CaF, → 1. 1.(c) Answer ALL parts (i) to (v). (i) Draw the structure of the enolate ion 5 formed by deprotonation of the ester 4 by the base NaOEt. (ii) Suggest a mechanism for the formation of the enolate 5 and for its reaction with ethanol to produce the diastereoisomeric ester 6. (iii) For each diastereoisomer (4 and 6) draw the two chair conformations (4 chair diagrams in total). (iv) By referring to your chair diagrams, predict which diastereoisomer (4 or 6) will predominate when equilibrium has been reached. (v) What do you think the result would be if the reaction was instead performed using NaOMe in MeOH? NaOEt O H он OEt OEt Ме. Me Ме Ме. Me- Me 4. 9(b) acid, HNO3 to produce compound L. The reaction of compound L with bromine, Br2 in the presence of iron tribromide, FeBr3 produced compound M. Benzene also undergoes Fridel-crafts alkylation reaction with chloroethane, CH;CH2CI using catalyst N to produce compound P. Benzene, CeHe undergoes substitution reaction with concentrated nitric Benzena, CsHe menjalani tindak balas penukargantian dengan asid nitrik, HNO, pekat untuk menghasilkan sebatian L. Tindak balas sebatian L dengan bromin, Brz dengan kehadiran ferum tribromida, FeBrs menghasilkan sebatian M. Benzena juga menjalani tindak balas alkilasi Fridel-crafts dengan kloroetana, CH3CH2CI dengan menggunakan pemangkin N untuk menghasilkan sebatian P. (i) Draw the structural formula of L, M and P. Lukiskan formula struktur bagi sebatian L, M dan P. (ii) State catalyst N. Nyatakan pemangkin N. (iii) Show the formation of electrophile that will be reacted with benzene for the formation of compound P.