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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- Provide 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 CN7 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 ÕHFollowing 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.
- The 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.For each compound, give the product(s) expected from (1) HgSO4>H2SO4@catalyzedhydration and (2) hydroboration–oxidation.(a) hex-1-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.
- 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-yne7В. (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.Give the products for each of the following reactions. (a) (b) (c) + H₂cod OCH3 о || -COCH 3