For the dehydrohalogenation (E2) reaction shown, draw the Zaitsev product(s) resulting from elimination involving C2–C3 (i.e., the carbon atoms depicted with stereobonds). Show the product stereochemistry clearly. If there is more than one organic product, both products may be drawn in the same box. Ignore elimination involving C2 or C3 and any carbon atom other than C3 or C2.
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there is supposed to be two products here
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- 1) Show how you could synthesize (Z)-5-octene-2-ol using precursors that contain fewer than five carbon atoms (<5). You may use starting materials containing more than five carbon atoms if no more than four of the carbon atoms from that precursor remain in the final product. Note: (Z)-allylic bromides and chlorides are not stable and spontaneously rearrange to the (E) isomers.2. Fill-in-the-blank: Draw the reagents or the major organic product(s) for each reaction in the boxes provided. Stereochemistry should be shown if applicable. HBr KMnO4, NaOH coldDraw a structural formula for the more stable carbocation intermediate formed in the reaction shown. CH3CH₂ H H c=c" cms CH3 CH₂CCH3 CH3 + HBr • You do not have to consider stereochemistry. . Do not include anionic counter-ions, e.g., I, in your answer. • For cases in which carbocations of the same or similar stability are expected, draw all of the structures. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate structures with + signs from the drop-down menu.
- Although there are nine stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane, one stereoisomer reacts 7000 times more slowly than any of the others in an E2 elimination. Draw the structure of this isomer and explain why this is so.Use line structures and provide the missing substrate(s), reagent(s) and products (B - F) in the reactions below. One alphabetical letter may represent more than one substrate/product. Where stereochemistry is applicable, more than one product is required. The stereochemical relationships between product stereoisomers and mechanisms are not required. Please note the direction of arrows. (7) OH NaH В E C No acid! H20, HO- i. O3 ii. Zn, H20 D + iii. Cro3, H,SO, (aq) i. BH2, THE ii. Н,О, но F 3/4 ANSWERS (B – F):3. Below is a substitution reaction that involves neighbouring group participation (NGP) in its mechanism. CH3 H- Br HBr Но CH3 (i) Predict the product(s) formed. Label the stereochemical assignments of the reactant and the product(s). Also, roughly predict the percentage(s) of formation of each of the product(s). (ii) Show a mechanism that agrees with your answer above.
- Curved arrows are used to illustrate the flow of electrons. Use the reaction conditions provided and follow the curved arrows to draw the product of an SN2 reaction shown below. Include all lone pairs and charges as appropriate. Use wedge and dash bonds to indicate stereochemistry where appropriate. Ignore inorganic byproducts. :N=C: H3C THE Drawing H Br: Q I IB. Describe the stereochemistry (with structures) of the addition of Br2 and H₂O to cyclohexene. C. Arrange the following ions by increasing basicity, where 1 is the most basic and 5 is the least. HCEC CH3CH3NH2 CH3CH₂O CH3CH₂ H₂C=CHb) Optical isomers can often be formed during these reactions. For products A-H indicate how many different optical isomers you expect to form for each from these reactions (you do not have to indicate whether they are diastereomers/enantiomers). c) In the preparation of substance D by ozonolysis, the second step is necessary treatment of the reaction mixture with zinc in acetic acid. If we forgot this step, we would get substance V instead of substance D, which would probably explode when isolated. What is the structure of substance V? *24 X 1: ozone V e) What products do you expect to form if they react with alkene X: I - HBr in diethyl ether; II - Brl in methanol; III - PhSCI in diethyl ether; IV - Selectfluor in methanol. P M EtOH NA EtONa PhSNa EtOH E H+ O TsCl Pyridín F- T2, Pd/C G4 mCPBA H₂SO4 10 %, H₂O 1: BH3 H◄ 2: H₂O₂ ill X Br₂ cyclohexane HCI A > В B HBr warmth, benzoylperoxid 1: ozone 2: Zn, ACOH Mg THF с D D₂O K I + J NaOH
- Draw the structure(s) of the major organic product(s) of the following reaction. You need not specify stereochemistry. If more than one product is formed, draw all structures in the same sketchpad. 1. LIAIH4/dry Et₂O 2. aqueous HCIDraw the major condensation product obtained by treatment of 3,7-nonanedione with sodium ethoxide in ethanol. You do not have to consider stereochemistry. You do not have to explicitly draw H atoms. Do not include lone pairs in your answer. They will not be considered in the grading.Draw the product of the reaction shown below. Use a dash or wedge bond to indicate the stereochemistry of substituents on asymmetric centers, where applicable. Ignore inorganic byproducts. OsO4 (catalytic) NMO P