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- Which compound is a major product of the reaction sequence shown (1) Li, NH3, -35°C A (2) mcРBA/CH,сЬ OH D HO- OCompound B )Compound A Compound DThe answer choices for part b ["How would you convert the alkene to a epoxide?"] are: (a) Br2/NaNH2 in liq NH3; (b) mCPBA; (c) OsO4Thank you!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 ÕH
- What is the main product of the E2-elimination reaction shown in the box? CH;CH,ONa ? Br CH;CH,OH A) B) OCH,CH3 D) OD В O Awhat is the major E1 product for the structure?SP asuno Answer (d) QUESTION 5 The introduction of one of the following substituents to a benzene ring through diazonium salt substitution does not require a copper salt. What is the identity of that substituent? (a) I (b) Br (c) CI (d) CN O Answer (a) Answer (b) OAnswer (c) Answer (d) QUESTION 6 Which one of the following compounds does not undergo an aldol reaction with itself when treated with NaOEt in EtOH? O O O O
- Which is the product of an aldol condensation of two molecules of 3-methylbutanal? (A) (C) (A) (B) (C) HO (D) H H Which conversion is energetically favorable? or (B) i i (D) H H CI CI 2 2 Hoi HOWhich reagent would afford the single regioisomer shown via an E2 elimination in highest yield? tor NH3 CH,OH (A) (B) (C) O A В 1 ntso OH 3) Please draw the structures that correspond to omitted structure for each of the following synthetic sequences. HO Cro3 Cl (d) Cro3 (a) Product `OH Product OH H30 H30 HO PCC Cl PCC (b) Product (e) `OH Product "OH HO РСС NABH4 (f) Starting Material Product 'OH ELOH
- OUESTION 1 (a) The cyclization of sugars is a nucleophilic addition to a carbonyl compound. Redraw sugar A shown below, and indicate which atom is the nucleophile, and which is the electrophile. (b) Draw the mechanism of cyclization of the sugar A to form the B-pyranose, and represent the product as a Haworth projection. OH ОН ОН CH,OH A ОН ОНDraw the product of the substitution reaction shown below. Ignore the inorganic byproducts. (CH3)3 SiLi DMSO Draw SN2 product BrWhich compound is the major product of the reaction sequence shown? (1) SOCE (A) (B) OH OH (2) (CH3);CO Na (CH3);COH (C) (D) O Na Na CI Compound D Compound A Compound C Compound B