Which answer describes the relationship between these compounds? (a) OH H OH H (b) H. They are the same molecule. Enantiomers Diastereomers Both Meso OH OH H
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- 5-51 Draw examples of the following: (a) A meso compound with the formula C8H18 (b) A meso compound with the formula C9H20 (c) A compound with two chirality centers, one Rand the other S1) Mark the chiral centers in the following molecules, if any, with an asterisk (*). (b) (a) НО HO HO OH OH (c) (d) *H₂N- НО HC CH3 CH3 c-0 О None OHIn the molecules below (a) H (b) O H-C-OH HO-C-H H-C-OH HO-C-H HO-C-H HO-C-H H-C-OH -CIO CH,OPo, CH,OPO, CH,OPO, CHOPO, Which molecule is the enantiomer of molecule a? which molecule is a diasteromer of molecule b?
- NH2 N CH2 CH2 The stereochemistry around this chiral carbon is: O cannot be determined. O Rand S OR OSWhich of these compounds is expected to be optically active at room temperature? ÇOOH H OH CH, CH, Br но- Br CH H- OH COOH CH (A) (B) (C) (D) O B OD O ADraw all the possible stereoisomerism for following structures. Label the chiral centre with an asterisk (*) if any. (a) CНICOОH)(NH)CH-COOH (b) (CH3)2C=C(COOH)CH(NO2)CH3
- 1) Mark the chiral centers in the following molecules, if any, with an asterisk (*). (b) (a) НО НО НО ОН 0 OH (c) (d) *H3N-H HOT -С-0 HC-CH3 CH3 ОНThe following molecule, 3,17-B-estradiol, is the most physically active estrogen and is widely used in medications to prevent problems such as osteoporosis. Locate all stereogenic centers in this molecule. (You do NOT have to identify as R- or S-) chiral HO OH oth2 Draw all stereoisomers for the following molecules; indicate the stereochemica interrelationships (enantiomer, diastereomer, or meso) for all its possible pairs. 4) H;C CH3 Но CH3 OH CI CI Но OH
- 129 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 compoundsIdentify the relationship between the following pair of structures by describing them as represting enantiomers, diastereomers, constitutional isomers or two molecules of the same compounds (a) (c) H H₂C H F Br Oll F CH3 Br H and Br. CH3 H and Fumus (d) H H X-X=-= CH3 H CH3 (b) Br HO CHO and -OH H C(O)CH3 and HO H- CHO -H -OH C(O)CH3Identify the relationship between the following pair of structures by describing them as represting enantiomers, diastereomers, constitutional isomers or two molecules of the same compounds (a) (c) H CH3 Br. CH3 Br f-f and Filmas H H CH3 H F Oll H CHO Br X-X ²=-= -OH HO and and H Br H- F C(O)CH, H (b) CH3 (d) H- and HO CHO -H -OH C(O)CH3