Identify the structure(s) of the product(s) for the following reaction taking into account regiochemistry and stereochemistry if relevant. (note: NIS = N-iodosuccinamide) NIS MeOH B D ○ A O O О OMe ŎMe B D OMe OMe
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- 7 Draw the structure of the product, substrate or condition in the following reactions (should clearly indicate the stereochemistry). (a) Mẹ 1) Os04 2) NaHŠO3 (b) 1) (sia)2BH 2) NaOH/H2O2 H2O (c) Он (d) Br2 Br Н ÕHProvide the structure of the organic products(s), which result in the reaction below. (Hint: it's a substitution product; show stereochemistry joll| CI CH3 Br CH3CH₂OH CNThe following equation shows the reaction of trans-2,3-diphenyloxirane with hydrogen chloride in benzene to form 2-chloro-1,2-diphenylethanol. (a) How many stereoisomers are possible for 2-chloro-1,2-diphenylethanol? (b) Given that opening of the epoxide ring in this reaction is stereoselective, predict which of the possible stereoisomers of 2-chloro-1,2-diphenylethanol is/are formed in the reaction.
- Following are diastereomers (A) and (B) of 3-bromo-3,4-dimethylhexane. On treatment with sodium ethoxide in ethanol, each gives 3,4-dimethyl-3-hexene as the major product. One diastereomer gives the E alkene, and the other gives the Z alkene. Which diastereomer gives which alkene? Account for the stereoselectivity of each -elimination.Draw resonance structures of the intermediate carbocations in tire bromination of naphthalene, and account for the fact that naphthalene undergoes electrophilic substitution at Cl rather than C2.For each compound, give the product(s) expected from (1) HgSO4>H2SO4@catalyzedhydration and (2) hydroboration–oxidation.(a) hex-1-yne
- 4 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 vitabFor each compound, give the product(s) expected from (1) HgSO4>H2SO4@catalyzedhydration and (2) hydroboration–oxidation.(a) hex-1-yne (b) hex-2-yne(c) hex-3-yneAssign the structure of the following reaction taking into account regiochemistry and stereochemistry if relevant. NBS MeOH Br A OMe В Br Br OMe Br D OMe A D B.
- 7В. (2 Draw the structure of the product, substrate or condition in the following reactions (should clearly indicate the stereochemistry). (а) OH (b) OsO vaHSO3 (c) 1) (sia)2 BH 2) NaOH/H,O2 H20 (d) HBr (2 equiv) Br, Br Hint: This is the only product formed (e) Br Br2 H20 OH (f)A key step in the synthesis of a natural product is shown below. Answer sections (iv) and (v) related to this reaction. OH R CO₂Me + S S P CO₂Me Heat H H CO₂Me (iv) Give a curly arrow reaction mechanism for the formation of compound Q and suggest why the formation of the given diastereomer is favoured. (v) Compound P can be formed from S and R. Suggest the identity of S and state what type of reaction can be used to form P.The treatment of (CH3)2C = CHCH2Br with H2O forms B (molecular formula C5H10O) as one of the products. Determine the structure of B from its H NMR and IR spectra.