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(a) meso-hexane-3,4-
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- 4-Chloro-2-pentene has a double bond that can have either the E or the Z configuration and a stereogenic center that can have either the R or the S configuration. How many stereoisomers arepossible altogether? Draw the structure of each, and group the pairs of enantiomers.Draw the structural formula for at least one bromoalkene with the molecular formula C5H9Br that shows: Q.)E,Z isomerism but not chirality(a) (R)-1,1,2-trimethylcyclohexane, draw a three-dimensional representation.
- Draw a three-dimensional line structure for (3S,6E)-6-isopropyl-2-methyloct-6-en-3-ol.Write the name of the following compounds. Which of them are stereoisomers? Which of them are optically active? Use cis-trans, (E)(Z) nomenclature and assign the absolute configuration (R),(S), if any to each chiral center.From studies of the dipole moment of 1,2-dichloroethane in the gas phase at room temperature (25°C), it is estimated that the ratio of molecules in the anti conformation to gauche conformation is 7.6 to 1. Calculate the difference in Gibbs free energy between these two conformations.
- DHA is a fatty acid derived from sh oil and an abundant fatty acid in vertebrate brains. Hydrogenation of DHA forms docosanoic acid [CH3(CH2)20CO2H] and ozonolysis forms CH3CH2CHO, CH2(CHO)2 (ve equivalents), and HCOCH2CH2CO2H. What is the structure of DHA if all double bonds have the Z conguration?1. Complete the following diagram so that it represents (R)-2-bromobutane.A difficult problem in the synthesis of PGF2α is the introduction of the OH group at C15 in the desired configuration. a. Label this stereogenic center as R or S. b. A well-known synthesis of PGF2α involves reaction of A with Zn(BH4)2, a metal hydride reagent similar in reactivity to NaBH4, to form two isomeric products, B and C. Draw their structures and indicate their stereochemical relationship. d. Suggest a reagent to convert A to the single stereoisomer X.