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- How many stereocenters are there in the marine micro-algal toxin portimine? Label all stereocenters with an asterisk. Assign the stereochemistry in cases where this is unambiguously possible. N OH OH Identifying Enantiomers, Diastereomers, and Meso Compounds Stereoisomers of 3-bromo-4-fluorohexane A student was given a sample containing a mixture of stereoisomers of 3-bromo-4-fluorohexane that was contaminated and was asked to identify all of the possible stereoisomers of 3-bromo-4-fluorohexane that could be present so they could isolate the contaminant. ▼ Part A 3-Bromo-4-fluorohexane has two chiral carbon atoms; therefore, the maximum number of possible stereoisomers that can be formed is four (determined by using the formula 2", where n is the number of chiral carbon atoms). Draw the four possible stereoisome 3-bromo-4-fluorohexane. Draw the molecules on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. Show the appropriate stereochemistry by choosing the dashed or wedged buttons and then clicking a bond on the ca ► View Available Hint(s) NN [1] Submit F LL 7 H 12D EXP. L L CONT. 7 Br 4 H Z O C N O S CI Br I 32 P TI FTwo diastereomeric sets of enantiomers, A/B and C/D, exist for 3-bromo-2-butanol. When enantiomer A or B is treated with HBr, only racemic 2,3-dibromobutane is formed; no meso isomer is formed. When enantiomer C or D is treated with HBr, only meso 2,3-dibromobutane is formed; no racemic 2,3-dibromobutane is formed. Account for these observations.
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- 2-Acetoxycyclohexyl tosylate reacts with acetate ion to form 1,2-cyclohexanediol diacetate. The reaction is stereospecific—that is, the stereoisomers obtained as products depend on the stereoisomer used as a reactant. Recall that because 2-acetoxycyclohexyl tosylate has two asymmetric centers, it has four stereoisomers—two are cis and two are trans. Explain the following observations:a. Both cis reactants form an optically active trans product, but each cis reactant forms a different trans product.b. Both trans reactants form the same racemic mixture.c. A trans reactant is more reactive than a cis reactant.alfa ll 0 O DI 12I 9:07 The relationship between the following molecules is best described as : CH3 CH3 H -Br Br- H -Br Br CH3 CH3 H. Enantiomers diastereomers identicals Differents How many stereocenters is (are) in the following molecule? CN Br two threeWhat is the absolute stereochemistry at carbons 1,2,3, and 5 ?