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- A key step in the hydrolysis of acetamide in aqueous acid proceeds by nucleophilic addition of * OH (a) H3O* to CH3Ĉ NH2 (b) H2O to CH3ČNH2 + OH +OH (c) H3O* to CH,ČNH2 (d) HO¯ to CH3CNH24 Which of the following alcohols could not be made selectively by hydroboration-oxidation of an alkene? Explain. about the (b) (a) (c) OH | CH3CH₂CH₂CHCH3 In H OH (CH3)2CHC(CH3)2 (d) CH3 vino zbiory 1 OH o no atou OH vollot edt evig H noituloa siblos V H но но CHO SHO=3₂HƆ m² CH3s 10 out of ST bewollot giaylonoso no WBTⱭ 12-8 His to edustrie 5 wode, $2-8 OnMX dilw osviel vitabOH - NH, Br2/KOH →product; 1. (a-hydroxy amide) Product of this Hoffmann bromamide reaction is : OH (a) Ph – Ĉ-CH3 (Ъ) Ph — CHO (c) Ph- CH3 (d) Ph – CH2 -NH2 NO2
- Draw the organic products formed in each of the following reactions. (i). (ii) (iii) (iv) +:C=C-H + H₂O CH₂C=CCH₂CH3 HgSO4, H₂SO4 Na, NH3 2 equiv Br₂ (1) Sia₂BH.THF (2) H₂O₂ NaOH(c) With reference to the following reaction scheme: Met N Me Boc 20 OMe DIBAL, toluene, -78 °C then H₂O w/up Me+N Mé Boc 21 H Useful structure: DIBAL= H₂ Al Y Bary (i) Provide a curved arrow mechanism for the reduction of ester 20 to aldehyde 21. (ii) Explain why the reduction of ester 20 selectively affords aldehyde 21 in the presence of DIBAL, whereas treatment of 20 with LiAlH4 leads to over-reduction.The Claisen condensation of two molecules of ethyl phenylacetate (shown below) in the presence of sodium ethoxide (NaOEt) leads to which of the following products? .CH3 C,H;CH,C-CH2C,H5 CGH5CH2C-O-ĈCH2C,H5 C6H5CH2C-CHCO,C,H5 C,H,CH,C- -CH,CO,C,H5
- If anhydrides react like acid chlorides with the nucleophiles, draw the products formed when each of the following nucleophiles reacts with benzoic anhydride [(C6H5CO)2O]: (a) CH3MgBr (2 equiv), then H2O; (b) LiAlH4, then H2O; (c) LiAlH[OC(CH3)3]3, then H2O.Give at least two methods for the synthesis of 2-methylpropane. What happens if it is treated with: a) HNO3 dilute, t °C, p; b) Br2/t °C; c) H2SO4 conc. In the case of the reaction with HNO3 dilute, t °C, p the mechanism is required.Stereoisomers of α-bromocinnamic acid: draw the reaction mechiansim with arows for the dehydrobromination of 2,3-dibromo-3-phenylpropanoic acid with ethanol and KOH to produce (Z)-α-bromocinnamic acid and (E)-α-bromocinnamic acid. Also draw the transition state for The (Z)-isomer syn-periplanar transition state and anti-periplanar transition state of the (E)-isomer.
- 4-Methyl-2-pentyne gives which product upon bromination followed by KOH/ethanol? (1) COOH (3) (4) Br Compound (1) a. Compound (2) Compound (3) OG. Compound (4) d.A molecule of propanone reacts with an cyclohexylethanone in presence of aq. NaOH to combine together, and the resulting product is boiled to produce another product, (i) CH3 -NH2 НО H;CO5) Draw the product of the reaction of (S)-pentan-2-ol with (a) SOCI₂ in diethyl ether (b) Dess-Martin Periodinane in CH₂Cl2 6) Draw the product of the reaction of 4-methylpentanoic acid with (a) (1) NaBH4, ethanol (2) H3O+ (b) (1) LiAlH4, ether (2) H3O+