Draw all the possible stereoisomers for each compound and label pairs of enantiomers and diastereomers: (a) CH,CH(OH)CH(OH)CHsi (b) CH3CH(OH)CH(CI)CH3.
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- Which compounds contain chiral centers? (a) 2-Chloropentane (b) 3-Chloropentane (c) 3- Chloro-1-pentene (d) 1,2-Dichloropropane129 Identify the relationship in each of the following pairs. Do the drawings represent consti- tutional isomers or stereoisomers, or are they just different ways of drawing the same compound? Ir they are stereoisomers, are they enantiomers or diastereomers? (Molecular models may prove useful in this problem.) CH) (a) C-CH,Br and c-CH,OH HO Br CH, H. Br H, (b) C-Br and CH, CH,CH, CH,CH, CH, Hc H C-CH,CH, (c) C-Br and CH,CH, Br CH, and Br CH,CH, CH,OH CH,OH (e) HOH ČHOH and но- ČH,OH H,C (r) and For Problem No. 7.29 (a) to (f), IDENTIFY the given pair of structures as described below and WRITE: EN if the pair represents ENANTIOMERS DI if the pair represents DIASTEREOMERS co if the pair represents CONSTITUTIONAL isomers ID if the two molecules represent IDENTICAL compoundsClassifying Compounds as Stereoisomers or Different Conformations Classify each pair of compounds as stereoisomers or conformations: (a) X and Y; (b) X and Z.
- PGF 2a is a prostaglandin, a group of compounds that are responsible for inflammation (Section 19.6). (a) How many tetrahedral stereogenic centers does PGF 2a contain? (b) How many double bonds can exist as cis and trans isomers? (c) Considering both double bonds and tetrahedral stereogenic centers, what is the maximum number of stereoisomers that can exist for PGF20? OH HO -CH₂CH=CH(CH₂)3COOH CH=CHCH(OH)(CH₂)4CH3 PGF₂αWhich of the following statements is true for compounds A and B? H CI CI, H H CI H CI A B (A) A and B are enantiomers. (B) A and B are diastereomers. (C) A and B are constitutional isomers. (D) A and B are two conformers of the same molecule. (E) A and B are not isomers.Label the two stereogenic centers in each compound and draw all possible stereoisomers: (a) CH;CH2CH(CI)CH(OH)CH,CH3; (b) CH;CH(Br)CH,CH(CI)CH3.
- (a) assign R or S configuration to each chiral center, (b) Which compound are enantiomers? (c) Which compounds are diastereomers?Draw all possible stereoisomers of the following compound (there are four of them). You need to consider both the chiral carbon and the double bond CH;CH=CHCH(CI)CH3OH A B NH2 NH2 Which labelled carbon (A or B) is chiral? (A) B B) A
- Classify the following compounds as chiral, achiral (but not meso), or meso. 1st structure: 2nd structure: 3rd structure: HO H ||** OH chiral achiral CFour stereoisomers exist for 3-penten-2-ol. (a) Explain how these four stereoisomers arise. (b) Draw the stereoisomer having the E configuration about the carbon-carbon double bond and the R configuration at the chiral center.Following are stereorepresentations for the four stereoisomers of 3-chloro-2-butanol. (a) Assign an R or S configuration to each chiral center. (b) Which compounds are enantiomers? (c) Which compound are diastereomers?