Naproxen (shown below) is an over-the-counter pain reliever. It is the active ingredient in Aleve. What is the maximum number of stereoisomers possible for this structure? 4000 HO
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- Shown below is Streptomycin, an antibiotic medication used to treat a number of bacterial infections, including tuberculosis, plague, and endocarditis. Neomycin B has broad-spectrum antibacterial activity. Circle and label as many functional groups in these molecules as you can. Label each chiral carbon in Streptomycin. How many total stereoisomers exist for Streptomycin? Label each chiral carbon in Neomycin B. How many total stereoisomers exist for Neomycin B?Part D. Do the two structures A and B of each pair drawn below represent the same molecule, constitutional isomers, or stereoisomers? If A and B are stereoisomers, further classify them as enantiomers or diastereomers. H3C Structure A H3C HO H3C H3C Br T H H3C H HO H3CC H C Br HC H H H H CH₂Br CH₂CH3 H CH₂CH3 CH₂OH OH H HO G G H HO H HO G CH3 CH3 CH3 Br Hallo H H3C H Structure B H3C CH3 Br WING H Br HOCH₂ CH3 CH3 HO H CH₂OH H CH₂CH3 H CH₂CH3 H H H H H H Gim CH3 H OH "H ·GII. CH3 HO. OH OH CH3 CH3 OH Relationship of A and B5. a) How many stereocenters does this compound have? CH¸Br b). How many stereoisomers are possible for this compound?
- 5. How many stereocenters does this compound have? How many stereoisomers are possible for this compoundBased on the structures of lycopene and β-carotene, which are two chemicals found in another common vegetable, the tomato, answer the following questions: 1. Are they stereoisomers, constitutional isomers or not even isomers? 2. Do you expect them to be relatively polar or nonpolar substances? Why? 3. How many double bonds are in lycopene? How many in β -carotene? 4. As lycopene is transformed into β -carotene, how many pi electrons from the double bonds are transformed into single bonds? How many new single bonds are being formed in β -carotene? 5. The first step of a possible mechanism for the ring closure in the transformation is outlined below (only part of the structure is shown for simplicity). Draw the product that results from this arrow pushing mechanism. Be sure to include any formal charges that arise from the carbon atoms.1a. How many stereogenic centers are present 1c. Draw a three-dimensional structure of a in the structure below? Indicate them with asterisk(s). How many stereoisomers stereoisomers are possible? chiral compound with the molecular formula of C4H4Cl₂ that does not have a stereogenic carbon. In addition, draw the enantiomer of this compound. Number of stereogenic centers: Number of stereoisomers possible: 1b. Draw one of the two most stable stereoisomers of the compound in 1a using a planar structure with wedges and dashes. Now draw it in its preferred chair conformation. 1d. Draw two meso compounds with the molecular formula of C7H14.
- Stereoisomers are isomers that differ in spatial arrangement of atoms, rather than connectivity of atoms. Stereoisomers have different properties, especially in biological systems. Which is the stereochemical relationship between this pair of molecules? OH "OH 8p OH OH ...||| 4 A) enantiomers B) diastereomers C) identical compounds D) constitutional isomers E) Not isomers2. Assign the stereochemical configuration of the selected carbon-carbon double bonds (E, Z or N (not a stereocenter)) that are indicated by the arrows. a) HN H,, H3CO HO H HHow many tetrahedral stereogenic centers does PGF2α contain? Draw its enantiomer. How many of its double bonds can exhibit cis-trans isomerism? Considering both its double bonds and its tetrahedral stereogenic centers, how many stereoisomers are possible for PGFα?
- 2 Identify the following pairs of compounds as identical or isomers. If they are isomers, are they constitutional isomers or stereoisomers? If they are stereoisomers, are they enantiomers or diastereomers? Clearly write the words- identical, enantiomers, diastereomers, constitutional isomers. H3C CH3 and H3C. H3C Br H.Which of the following statements is/are true about the mirror-image stereoisomer of the molecule, shown below? OH OH HO i) The mirror-image stereoisomer of the compound shown has identical biological activity. ii) The mirror-image stereoisomer of the compound shown has the same melting point. iii) The mirror-image stereoisomer of the compound shown rotates plane-polarized light by the same amount but in the opposite direction. O only ii and iii are true O all of the statements are true O only i and iii are true O none of the statements are true O only i and ii are trueAs mentioned in Problem 3-53, the statin drugs, such as simvastatin (Zocor), pravastatin (Pravachol), and atorvastatin (Lipitor) are the most widely prescribed drugs in the world. (a) Are the two indicated bonds on simvastatin cis or trans? (b) What are the cis/trans relationships among the three indicated bonds on pravastatin? (c) Why cant the three indicated bonds on atorvastatin be identified as cis or trans?