b. HS c. If you would like to use more than three steps, feel free to do so! Just make sure you add a number for each step. hot C mcpa. Br 1. 2. Na OH 3. Ht OH "OCH3 + enantiomer
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- Which compounds are meso compounds? CH;CH2 CH2CH3 CH OH H Br a. b. HOC HOC- H. C. CH3 Br HCCHa H;C Enantiomers are mirror images of one another no matter which way you turn them, they can't be superimposed. If molecules can be superimposed, they're achiral - and there's no optical isomerism Example H. H. H2N NH2 OH OH Task 6 CH,OH H.C CH, -C HO H. Hchem 534 cha Hư OAC H please show stereochemistry H₂ COCH ? H CO₂CH3 O Ac 2. + ? hv 9 40°C 3. H₂ C 4. 0°C Catq Q-0 + [6+4] NGC ?. لك 5. [ V-CO₂CH3 + II NCCN [4+2] C6H5 6. 2 C6H5
- Which of the following compounds is an enantiomer of compound X ? CH₂ H₂C C CH3 OH 1 Select one: A. I OH O B. III O C. II H₂C- X H₂C || OH -CH₂ OH -CH₂ OH H₂C- CH₂ -CH₂ OH E OH |||a. Fill in the boxes with the missing structures. Be aware of stereochemistry. 1. LDA H3CO₂C 2. J CN Br t-BuOK THF H3O A5. For the following: Answer I, II, III and/or IV CH3 ÇH3 ÇH3 CH3 но- HO-- но- - H HO- H- HO- но- H. HO- но H- H- C2H5 C2H5 C2H5 C2H5 III IV ... a. Which structure is an enantiomer of I? b. Which structure is an enantiomer of III? c. What two structures are diasteriomers of II?
- please explain (2 R,4 S)-2,4-Dichloropentane and (2 S,4 R)-2,4-dichloropentane are: O A. constitutional isomers. O B. enantiomers. O C. diastereomers. O D. identical. O E. conformational isomers.Which of the two molecules below has more stereoisomers? O O I O Br B. I, because II is a meso compound C. because it has more chiral centers O D. II, because I has no enantiomer A. They have the same number of stereoisomers Br E. II, because I is a meso compound II Br SC. IDENTIFYING STEREOISOMERS: Label each pair of molecules below as enantiomers, diastereomers or identical CO₂H HO HC но-- н H -.Н CH3 OH CH₂OH HO™ H₂OC H₂C Н-- HO Н CH3 OHH CH₂OH HOC-... HOCH₂. H OH H OH HO H CHO COzH ОНС но с HO H COzH Н ОН НО Н CH₂OH
- Predict the major product of this series of reactions. The squiggly bond simply indicates the stereochemistry is unknown, i.e., wedge or dash. HBr compound I 1. NaH 2. compoundI 3. H2, Lindlar 4. Br2, H20 OH Br А. Br C. OH OH Br Br В. D. OH A.pt. 4: Molecular Models: Stereoisomers me: 4. Using the model of 2-bromobutane representing the R enantiomer from 4., switch any two groups on the chiral carbon. Compare this to your S enantiomer from 4. a. Are they the same or different? b. Are they the same or enantiomers? C. Now switch any pair of groups around the chiral carbon of the "switched" model again! Compare the "double-switched" model with the other unmodified S molecule from 4. Are they enantiomers or are they identical? С. Shown below is the Fisher projection of (R)-2-bromo-(S)-3-chlorobutane. ne mirror image of this stereoisomer and assign the RIS configurations of iral carbons for both isomers. е ll er10. These stereoisomers are; CO₂H H OH -H НО H- a. Identical -OH CH₂OH НО НО НО CO₂H -H H -H CH₂OH b. Enantiomers c. Diastereomers. d. meso isomers