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- Allenes are compounds with adjacent carbon-carbon double bonds. Many allenes are chiral, even though they don’t contain chirality centers. Mycomycin, for example, a naturally occurring antibiotic isolated from the bacterium Nocardia acidophilus, is chiral and has [α]D = -130. Explain why mycomycin is chiral.Rank the following groups in order of decreasing priority. −CH=CH2, −CH3, −C≡CH, −HWhat is the stereochemistry of the product made by the reaction of but-2-yne with 1 equivalence of H-Br? CH3 - C ≡ C - CH3
- Rank the set of substituents below in order of priority according to the Cahn-Ingold-Prelog sequence rules.1 = highest priority.(a) -ch3 (b) -br (c) -h (d) -iWhat is the ee for each of the following mixtures of enantiomers A and B? 95% A and 5% BHow many stereoisomers of 2,3- dimethylbutane exist? Group of answer choices 3 4 2 1
- 1.Draw both cis- and trans-1,4-dimethylcyclohexane in their conformations. (a) How many stereoisomérs are there of cis-1,4-dimethylcyclohexane, and how many of rans-1,4-dimethylcyclohexane? (b) Are of the structures chiral? (c) What are the stereochemicar relationships among the various stereoisomers of 1,4-dimethylcyclohexane?(a) Draw and name all five isomers of formula C3H5F.(b) Draw all 12 acyclic (no rings) isomers of formula C4H7Br. Include stereoisomers.2.35 Consider 1-bromo-2-methylpropane and draw the following.(a) The staggered conformation(s) of lowest energy(b) The staggered conformation(s) of highest energy
- 1. A solution has 80% (R)-2-bromobutane and 20% (S)-2-bromobutanea. What is the “enantiomeric excess” of (R)-2-bromobutane? b. If pure (R)-2-bromobutane rotates light 100º to the right, how much rotation would occur for a solution with 80% (R)-2-bromobutane and 20% (S)-2-bromobutane c. If a solution has a 50/50 mixture of (R)- and (S)-2-bromobutane, what would be the enantiomeric excess and the optical purity? 2. A mixture of two enantiomers has as observed rotation of -18°. The specific rotation of the (-) enantiomers is -27°. Find the % of the two enantiomers in the solution.Thuggacin C is a natural product with excellent biological activity. How many chirality centers does Thuggacin C have? a. 6 b. 7 c. 8 d. 9Rank the following groups in order of decreasing priority. a. – COOH, – H, – NH2, – OH b. – H, – CH3, – Cl, – CH2CI c. -CH2CH3, -CH3, -H, -CH(CH3)2 d. – CH = CH2, – CH3, – C ≡ CH, – H