Draw the major product for the reaction, showing the stereochemistry by using wedge bonds. The product will be racemic but show only one enantiomer. Clearly show stereochemistry by drawing one wedged, one dashed and two in-plane bonds per stereocenter. Remember that a hydrogen atom on a chirality center must be shown explicitly and with a wedge or dashed bond.
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- Please fill in the missing reactants, reagents or products in the following reactions. Indicate relative stereochemistry where it is necessary CI j)Kelerences Keview topic Draw a structural formula for the major product of the reaction shown. Cl2 H20 CH;CH2CH;CH=CHz • Show product stereochemistry IF the reactant alkene has both carbons of the double bond within a ring. Do not show stereochemistry in other cases. • If the reaction produces a racemic mixture, just draw one stereoisomer. 2reg 2reg M) ots 2reg pts 2req 1 pts 2req 1 pts 2reg ...1 pts ChemDoodle Previous Next> Save and Exit APR tv MacBook Air 80 DII DD F3 F4 FS F6 F7 F8 F10 F1 F12 #3 $ & + 3 4 6. 7 8 %3D dele E Y | { } P [ F G H. J K C V N M ? .. .. * C0 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
- Consider the stereochemistry of the equimolar mixture of compounds and its optical activity. Flm H3C F Which statement is true? Select one: the mixture is optically active the optical activity of the mixture cannot be determined by the information presented the mixture is optically inactiveTReview TOpics] [References Draw a structural formula for the major product of the reaction shown. CH3 CH3CHCH=CH2 Show product steréochemistry IF the reactant alkene has both carbons of the double bond within a • Do not show stereochemistry in other cases. If the reaction produces a racemic mixture, just draw one stereoisomer. C P opy aste C.Draw the major product of this reaction. Include stereochemistry if applicable. Use a dash or wedge bond to indicate the stereochemistry of substituents on asymmetric centers, where applicable. Ignore byproducts. Br CH3CO₂H Select to Draw
- 9. Which compound reacts with both NaBH and H/Pt to produce the same product? A) 1 4 2 B) II III CHO ||| D) None of these 10. Reduction of a carbonyl to produce a stereogenic center A) occurs with the formation of both diastereomers. B) occurs with the formation of both enantiomers. (C) occurs stereospecifically yielding a single isomeric product. D) none of these. MgBr 11. Which reagent would you use to produce (S)-1-phenylethanol from phenyl methyl ketone (acetophenone)? 12. A) S-CBS reagent B) R-CBS reagent C) NaBH +S-CBS reagent 4 D) NaBH + R-CBS reagent 4 An aldehyde can be produced by the reaction of the compound shown with which reagent? A) B) || D IV OCH3 I) H₁/Pt III) LiAlH4 II) NaBH4 IV) DIBAL-H 13. LiAlH reacts with which of the following? 4 A) | H .0 CI 0 EtO. 0 B) C) III D) All of these I II IIIA E OH OH H This is a(n) OH R B F PCC, CH₂Cl₂ H type reaction. The major product if R = CH₂CH3 is compound The major product if R = H is compound G Look at the given reaction and use the letter code corresponding to each compound in the blank to indicate the expected product(s), or fill in the blank with the appropriate vocabulary word or phrase. If a specific stereoisomer (e.g single enantiomer) is formed, select that isomer only. If a mixture of stereoisomers (e.g. racemic or diastereomers) is formed, select the single structure that shows the appropriate mixture (e.g. lines not dashes). If we convert the reagent to Na2CrO4, H₂SO4, H₂O: The major product if R = CH₂CH3 is compound The maior product if R = H is compound ??? OH D H H though compounda) H₂ Pd C-C -H and -H + A-B For the following reagents, indicate the following: a) what is added accross the double bond; b) is the addition stereoselective/stereospecific? If yes, do A and B add syn or anti?; c) draw the product, with relevant stereochemistry, when the reagent system shown is reacted with 1-methylcyclopentene. The answer to the first reagent system is shown below. (i) b) yes, syn addition | | -C-C- (achiral, stereochem. not observable) | I A B (ii) a) 1) 9-BBN 2) H₂O2, NaOH(aq) b)
- Starting 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. H H|||| Br H₂C Br H CH₂ Edit Newman Projection CH3 CH3Draw the structure for an alkene that gives the following reaction product. CH3 HCI CH3CHCH2CHCH3 CI • Ignore alkene stereochemistry. •You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. P. opy aste ChemDoodle"10) Show the product of the following elimination reaction. You must also show both chair conformations (i.e., draw one and then ring flip to directly obtain the other conformation), and indicate the relevant conformation in which elimination occurs Br œ K'O rox.