xample, consider the structure of following compound which belongs to a class of compounds called allenes. "his allene is chiral. Draw its enantiomer. Me Me. c=c=c Based on your analysis in the previous problem, determine whether the following allene is expected to be chiral. Provide a brief explanation. Me Me. H-C=c=c Me
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- 1, part A) We observe 6 carbon stereocenters in the molecule below. Indicate each stereocenter, and give the absolute S or R configuration. 1, part B) Indicate each stereoisomer in this molecule, and give the absolute S or R configuration. Then, indicate E or Z configuration of all alkenes in it (*ignoring aromatic ring*).Provide the type of connectivity of the following halide. CI XPlease answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. Long and detailed explanations are not needed. Keep it short, brief, and direct because I only need the answers. Which of the two compounds below is/are chiral?
- 8. Two structures of Lipitor (a drug used to lower cholesterol) are shown below. (a) Determine the absolute configuration of each indicated stereocenter. Fill in the correct circle. (b) Determine if the two structures are the same compound or stereoisomers. Fill in the correct circle. (a) НО. Carbon a HO O OH Carbon a: OR OS Carbon b H N Carbon b: R OS of H Carbon c: OR OS OH OH Carbon c F Carbon d: R OS OH Carbon d (b) The two structures are: O the same compound O stereoisomers2. The following questions are designed to help acquaint you with identifying and drawing stereoisomers. a. Draw an enantiomer of the molecule below by depicting the following molecule as if it is reflected a mirror. b. Another quick way to draw an enantiomer is to invert every stereocenter in the molecule. If it's dashed, make it wedged, and vice versa. Use this method to draw the antibiotic tetracycline. OH O OH HO MeO OH HO OH c. Draw a diastereomer of the molecule below. Just invert as many stereocenters as you'd like, so long as you do not invert all. CO₂Me OH OH OH "NH₂There are several rings in this structure. As highlighted in the middle diagram, the two explicit H are both attached to a six-membered ring. As highlighted in the right-hand diagram, the two explicit H are both attached to a five- membered ring. What are the stereochemical relationships of these two H to each other with respect to these two rings (cis or trans)? Ph Ph H Ph Ph Ph Ph H Ph Ph Ph Ph H Ph Ph
- 4. Two IR spectra are shown. On is from an alkene, the other for an alcohol. Tell which is which. LOD LOD 3000 1640 610 810 3050 1376 1374 1445 1381 1472 2880 2875 2978 3210 2960 1039 D 400 3000 2000 1S00 1000 4000 3000 2000 1500 1000 MAVENUMB ERI l HAVENUMB ERI -l5) 1) MeO'Na* &r=&r MeOH 2) work-up (HCI, H₂O) 7) 8) NH OH 1) NaOH, H₂O 2) work-up (HCI, H₂O) HCI, H₂O heat 'H HO HO HCI, H₂O OH NH, CH How many stereoisomers are possible for this cyclic hemiacetal? OH5. Which one of the following compounds is the strongest base? Lil (CH3)2NLI LIOCH3 (CH3)3CH O LIOCH O uI O (CH3),NLI O (CHsCH 6. Which two of the following Newman projections represent conformations of 2-bromobutane? CH3 H,C. CH3 H. Н. CH3 H;C H;C ČH; H H. Br CH3 Br Br 1 2 3 H CH; H, Br H;C, H H;C Br CH3 CH3 H. H O 2 and 3 O 1 and 2 O 1 and 4 O 4 and 5
- • Consider the following compounds. Assign the R or S configuration to each stereogenic center (add answers onto structures): CH,CH, OCH3 CH3 CH,CH3 сно H;CO,C NH2 co,H 18 Assign the absolute configuration at the stereogenic centre C3 of compound Y. OH Compound Y Assign the absolute configuration at the stereogenic centre C2 of compound Y. Br HO 1 CF3 bund Y Assign the absolute configuration at the stereogenic centre(s) C2 abd C3 of compound Y. HO, HO, 20 Compound Y ר(a) Re-draw the following molecule with the CH2CH3 group on the ladder 1. H. H2 CF H3C H2 CH2 H;C Is the molecule in part (a) the same molecule or the enantiomer of the following. Circle your answer Explain your answer CH3 CH2 H,C SAME MOLECULE CH3 ENANTIOMER H2Which given option is correct for the following transformation? MCPBA H2SO4 1 2 CH3OH OH „OCH3 OCH3 A 1 2 1 OCH3 HO B D OCH3 2 1 2