FO 23: Identify and draw conformers. NH₂ NH2 NH2 NH2 NH2 NH2 1 NH2 NH2 4 2 3 (a) List any two structures that are related as conformers. Answer by listing exactly two numbers. (b) Draw one conformer of the new structure shown here: 1 and 3 (b) OH HO OH
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- Draw the most stable conformation of 1,4-dichlorobutane, using wedges and dashes to represent bonds coming out of the paper and going behind the paper, respectively.1E.) Which of the following two conformers is lower in energy? Both conformers are of equal enery O A Conformer A is lower in energy. B Conformer B is lower in energy. It cannot be determinedd) Molecular relationships; identify whether the compounds in each group are const. isomers, conformers, enantiomers, diastereomers, identical, meso or none of the above. ОН ОН H3C Br H3C LF H Br CH3 HO CI Br Br CI NH NH
- Which 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.Draw a Fischer projection for each of the following molecules shown in its zigzag conformation. (a) OH (b) OH (c) OH CI HO HO HO `CN HƠ CGH5 OH OH OH OHSketch the chair conformers for the following compound. Then identify which conformer is more and less stable. "CH3
- 5. (a) F H₂CH₂C (b) H ) Draw the three-dimensional structures for the following compounds. H CH3 & H3C NH₂ Br OH H CH3 BrCH, CH, CH CH, H CH H H B C CH, CH, H H CH, D a) Give the names of conformers, in the order shown. (2) b) Rank the four conformers in order of stability starting with the LEAST stable, through the MOST stable. (2) c) State the value of the dihedral angle for each conformer. (2)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 compounds
- Which of the following line drawings represents the correct stereochemistry o molecule shown in the Newman projection below? E + Н. H I CH₂CH3 LOH H CH3 OH OH || IV OH 5.... OH A) I B) II C) III D) IV KBuild a model (attach a photo) for any of the following compounds. What is their relationship: (i) Identical in the same conformation, (ii) conformers, (iii) enantiomers, (iv) diastereomers, (v) constitutional (structural) isomers or none of (i) – (v)? 4 1.4 он H. LOH $Bu CI $Bu Relationship:5) For the following: a) Draw the "flat" line structure of the following (be sure to indicate stereochemistry) Br OH b) Draw both chair conformations of the following compound. Indicate which form is the most stable H3C°