3. In the boxes provided, assign the stereochemistry (R, S) or configuration (E, Z) as appropriate. (5 points total, 1 point per box) H a) b) -N OH
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- Can you please help me out with this problem. Thanks6. a) For each of the following pairs of molecules, identify the stereochemical relationship. Are they enantiomers, diastereomers, constitutional isomers, or the same molecule. CH3 н— сно i) ii) CHO H3C-OH НО HO ОН CI H CI iii) iv) Br H H H CI H. Br CI CI CI b) Explain why carbocation A is formed in step 2, rather than carbocation B (formed by the mechanism shown below). A BStarting from the wedge-and-dash structure below (sighting down the indicated bond), rotate the back carbon to provide the structure in the conformation that will be capable of an E2 elimination. R/S stereochemistry is graded. # O H3C H Drawing > CI ||||| H Atoms, Bonds and Rings Tap a node to see s
- :$:$;$;$;$;$ draw out neatlyHD V/ CH3-C-CH- CI a) Draw the R, R stereoisomer of the molecule shown below. b) Draw the two Newman projections that show the anti-periplanar geometry required for E2 elimination of the molecule in part a). c) Draw the products of E2 elimination of the molecule in part a) and indicate the stereochemistry (E or Z).a) Draw the mechanism, using good curved arrow notation, for the reaction of 2-methyl-2- butene with bromine in water, omitting any stereochemistry: b) (R)-3-butyn-2-ol is treated with 2 mol of HBr, yielding optically active Compound A (C4H8OBr2). Draw the structure of the reaction with the correct stereochemistry. c) Name Compound A above, including stereochemistry. d) Compound A is treated with HBr to yield Compound B (C4H7Br3). The resulting solution is optically inactive. Draw the product(s) obtained and explain why there is a loss in optical activity.
- g) Reaction 1g pts] For 2-chloro-3-fluorocyclohexane, draw all possible stereoisomers, and identify their stereochemical relationships using the labels we used in class (E = enantiomers; D=Diastereomers; I = identical.) Make sure to label each chiral carbon in each compound with the correct R/S designation.4) After completing the scheme below, determine the most like mechanism and draw the structure (ECSF) of the product. Br RX: 1°, 2°, or 3°? CH3CO2 is.. SB or WB? GN or PN? Backside is unhindered? borderline hindered? hindered? Carbocation it would form is poor? borderline? You MUST draw with a hash or wedge! You MUST show ALL 4 groups at the stereocenter! This product formed by the mechanism good?Major product ?
- H3C Draw the alkene product of this Wittig reaction. Ph P CN ? • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Consider E/Z stereochemistry of alkenes. • Include H atoms at chiral centers only. • If a group is achiral, do not use wedged or hashed bonds on it. • Do not include lone pairs in your answer. They will not be considered in the grading.C. SN1 SN2 E1 E2 Initial Stereochemistry R CH3 H3C-CH2- -CH OH R TSCI (with pyridine) and -OCH2CH3 + Product(s)/Stereochemistry(ies) of reaction cS Draw the product of the reaction showing the stereochemistry at any stereogenic centers. **** H [1] H-C=C [2] H₂O draw structure...