What is the best description of the major product(s) of the following reaction? H₂, Pt A) A racemic mixture of enantiomers B) A pair of diastereomers C) Multiple stereoisomers D) An achiral molecule E) A single stereoisomer
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- What is the best description of the major product(s) of the following reaction? H₂, Pt A) A racemic mixture of enantiomers B) A pair of diastereomers C) Multiple stereoisomers D) An achtral molecule E) A single stereoisomer AWhich compounds (I-IV) form a set of stereoisomers?2-Acetoxycyclohexyl tosylate reacts with acetate ion to form 1,2-cyclohexanediol diacetate. The reaction is stereospecific—that is, the stereoisomers obtained as products depend on the stereoisomer used as a reactant. Recall that because 2-acetoxycyclohexyl tosylate has two asymmetric centers, it has four stereoisomers—two are cis and two are trans. Explain the following observations: a. Both cis reactants form an optically active trans product, but each cis reactant forms a different trans product. b. Both trans reactants form the same racemic mixture. c. A trans reactant is more reactive than a cis reactant
- 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 III2-Acetoxycyclohexyl tosylate reacts with acetate ion to form 1,2-cyclohexanediol diacetate. The reaction is stereospecific—that is, the stereoisomers obtained as products depend on the stereoisomer used as a reactant. Recall that because 2-acetoxycyclohexyl tosylate has two asymmetric centers, it has four stereoisomers—two are cis and two are trans. Explain the following observations:a. Both cis reactants form an optically active trans product, but each cis reactant forms a different trans product.b. Both trans reactants form the same racemic mixture.c. A trans reactant is more reactive than a cis reactant.What is (are) the major organic product(s) obtained from the following reaction? Br2 O (2R,3R)-dibromobutane meso-2,3-dibromobutane O (2S,3S)-dibromobutane O Racemic mixture
- Name the following compound including stereochemistry (R, S, E, and Z) CCH,CH,CH, H CH- CH,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.Identify the stereochemical configuration of this cyclic compound. CI R Os
- When Z-3,4-dimethylhex-3-ene is hydrogenated in the presence of Pd/C catalyst, the products are best described as a mix of 2 diastereomer products a racemic mix of R,S and S.R products a mix of 4 different stereoisomer products a meso product a racemic mix of R,R and S.S productsWhat is the stereochemical outcome of this reaction? 1. BH3-THF 2. H₂O2, NaOH (aq) a single chiral molecule enantiomers, unequal amounts diastereomers, equal amounts a single achiral molecule diastereomers, unequal amounts enantiomers, equal amounts product(s)Identify the reactants and products for the following reaction. Include predicted stereochemistry. (R)-2-butylchloride + CH3S¯→