Concept explainers
17-54 Following is the structure of immunosuppressant FK-506, a molecule shown to disrupt calcineurin-mediated signal transduction in T-lymphocytes.
(a) There are three carbon—carbon double bonds present in this molecule. Which of the three has the potential for cis/trans isomerism? Assign a cis or trans con?guration to each carbon-carbon double bond that has this possibility.
(b) How many stereocenters are present in this molecule? How many stereoisomers are possible for it?
(c) Are there any aromatic components in this molecule?
(d) Consider the two carbon atoms marked with asterisks. Assign an R or S con?guration of each stereocenter.
(e) Because of the presence of a 21-member ring, this molecule is described as a macrocycle. This ring is fashioned by three types of bonds, several carbon-carbon bonds, one ester, one hemiacetal, and one amide. Locate the ester and the hemiacetal.
(f) Draw the structural formula of the long chain compound that would result if the hemiacetal were to be cleaved to an alcohol and a carbonyl group.
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Chapter 16 Solutions
Introduction To General, Organic, And Biochemistry
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- Rank the compounds in order of increasing oxidation state (most reduced to most oxidized) for the carbon atom indicated in red (C*). H3C Ο Ο Ο Ο ||| < | < || || < | < ||| || < ||| < | ||| < || < | Ö: I H H3C Ö: II :O: I H₂C H H III :O Iarrow_forwardThe structure of Corticosterone is shown here. ОН H3C НО. H3C Corticosterone DOES NOT contain: an alkene group a ketone group O an ether group O an alcohol grouparrow_forwardDraw the structure of an alkane with molecular formula C7H16 that contains (a) one 4° carbon; (b) only 1° and 2° carbons; (c) 1°, 2°, and 3° hydrogens.arrow_forward
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- 11-63 (Chemical Connections 11C) In what way do Fre- ons negatively affect the environment?arrow_forward13-52 2,6-Di-/ezY-butyl-4-methylphenol (BHT, Section 13-4C) is an antioxidant added to processed foods to “retard spoilage.” How does BHT accomplish this goal?arrow_forward13-31 What structural features are common to vitamin E, BHT, and BHA (the three antioxidants presented in Section 13-40?arrow_forward
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