Syn dihydroxylation of the compound below yields two products. Draw both products and describe their stereoisomeric relationship (i.e., are they enantiomers or diastereomers?). KMnO4, NaOH Cold
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- When (S)-2-bromobutane undergoes an SN2 reaction with CH3O-, the product is the compound shown below. What is/are the configuration(s) of the product(s) obtained from this reaction? O equal mixture of R and S H₂C a mixture of enantiomers with more R than S S only CH3 CH OR only O a mixture of enantiomers with more S than R H₂ CH₂9. 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 IIIDraw all the major products resulting from the reactions below, taking into consideration both the regioselectivity and stereoselectivity of the reactions. If pairs of enantiomers form, draw both enantiomers. (NOTE: for the second reaction, draw out the hydrogen.)
- Draw all the major products resulting from the reactions below, taking into consideration both the regioselectivity and stereoselectivity of the reactions. If pairs of enantiomers form, draw both enantiomers. Br₂ CH3CH₂OH (in large excess) H₂, Pd/CIs dinocap chiral? If so, which of the possible stereoisomers are formed in this synthesis?What is the major product?
- When norbornene undergoes hydroboration-oxidation, a mixture of two stereoisomers is produced in a roughly 6:1 ratio. (a) Draw both of these isomeric products. (b) Which product is favored? Hint: You should build a model of norbornene and consider the transition state leading to each product. 1. BH3 THF ? 2. H2O2, NaOH, H,O Norbornene(−)-Menthol is the most stable stereoisomer of 2-isopropyl-5-methylcyclohexanol and has the R configuration at the hydroxyl-substituted carbon. (a) Draw the preferred conformation of (−)-menthol. (b) (+)-Isomenthol has the same constitution as (−)-menthol. The configurations at C-1 and C-2 of (+)-isomenthol are the opposite of the corresponding chirality centers of (−)-menthol. Write the preferred conformation of (+)-isomenthol.Predict the favored product of each of the following reduction reactions. If the product is chiral, draw both stereoisomers expected. (b) NaBD4 CH3CH₂OH NaBH4 CH3CH₂OH
- Compound A Br₂, H₂O Compound B (C8H15BrO) + enantiomer CH₂O O Compound C + enantiomer Draw the structure of Compound B (watch out for stereochemistry), and mechanisms for its formation from Compound A, and its conversion to Compound C.Ketones react with alcohols to yield products called acetals. Why does the all-cis isomer of 4-tert-butyl-1,3-cyclohexanediol react readily with acetone and an acid catalyst to form an acetal, but other stereoisomers do not react? In formulating your answer, draw the more stable chair conformations of all four stereoisomers and the product acetal for each one.Treatment of -D-glucose with methanol in the presence of an acid catalyst converts it into a mixture of two compounds called methyl glucosides (Section 25.3A). In these representations, the six-membered rings are drawn as planar hexagons. (a) Propose a mechanism for this conversion and account for the fact that only the OH on carbon 1 is transformed into an OCH3 group. (b) Draw the more stable chair conformation for each product. (c) Which of the two products has the chair conformation of greater stability? Explain.
