recit number6 - a 1-butene HCl b cyclohexene HBr c...

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Chem151 Fall2009 ProblemSet#6 1.Whichofthefollowingconformershasthehighestenergy? CH 3 Cl CH 3 Cl CH 3 Cl A B C 2.Whichofthefollowingstructure(s)represent(s)acisisomer? CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 A B C D 3.Drawthetwochairconformersforeachofthefollowing,andindicatewhichconformerismore stable: a. cis -1-ethyl-3-methylcyclohexane b. cis -1-ethyl-2-isopropylcyclohexane c. cis -1-ethyl-3-isopropylcyclohexane 3.Foreachofthefollowingdisubstitutedcyclohexanes,indicatewhetherthesubstituentsinthetwo chairconformerswouldbebothequatorialinonechairconformerandbothaxialintheother or one equatorialandoneaxialineachofthechairconformers: a. cis -1,2- b. trans -1,2- c. trans -1,4- d. cis -1,4- one of each both both one of each
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4.Whatstereoisomersareobtainedfromthefollowingreactions:
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Unformatted text preview: a. 1-butene + HCl b. cyclohexene + HBr c. cis-3-heptene + Br 2 d. trans-3-hexene + Br 2 5. Draw all possible stereoisomers for each of the following compounds. Indicate if no stereoisomers are possible. a. 1-bromo-2-chlorocyclohexane b. 2-bromo-4-methylpentane c. 3,3-dimethylpentane d. 3-heptene 6. Which of the following are optically active? CHBr 2 Cl BHFCl CH 3 CHCl 2 CHFBrCl BeHCl 7. Give the products, including their configurations, obtained from the reaction of 1-ethylcyclohexene with the following reagents: a. HBr b. H 2 , Pt/C c. BH 3 /THF followed by HO-, H 2 O 2 , H 2 O d. Br 2 /CH 2 Cl 2 Cl Cl Br Br Br Br Br Br Br Br Cl Br Cl Br Cl Br Cl Br Br Br OH H H OH Br Br Br Br...
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