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- Which of the following Newman projections of 1-bromo-2-methylpropane represents the LEAST stable conformation? Br a) H₂CH3 H H c) I I H Br & CH3 H CH3 b) d) H H Br CH3 H CH3 Br H H₂C CH3Starting from the wedge-and-dash structure below (sighting down the indicated bond), rotate the back carbon to provide the structure in the conformation that will be capable of an E2 elimination. R/S stereochemistry is graded. H H|||| Br H₂C Br H CH₂ Edit Newman Projection CH3 CH3Draw all of the products, both constitutional isomers and stereoisomers, of the following reactions. a) 4,4-dibromo-1-ethylcyclopentene ---->Br2,H2O b) 3,3-dibromo-1-ethylcyclopentene ----> HBr c) 3,3-dibromo-1,2-dimethylcyclopentene ----> 1. BH3. 2. H2O2, NaOH
- Which of the following is the highest energy conformation of the following compound looking down the indicated bond? 01 O 11 O III SO IV OV CH3 H 13 CH3 1 HH CH3 CH3 11 CH3 H CH3- CH3 H CH3 CH3 13-0 H III H HCH3 CH3 IV CH3 H CH3 CH3 CH3 H CH3 VDraw both cis- and trans-1,4-dimethylcyclohexane in their more stable chair conformations. 5-72 (a) How many stereoisomers are there of cis-1,4-dimethylcyclohexane, and how many of trans-1,4-dimethylcyclohexane? (b) Are any of the structures chiral? (c) What are the stereochemical relationships among the various stereoisomers of 1,4-dimethylcyclohexane?Compounds 1 and 2 were prepared, and the difference in their heats of combustion was found to be 17.2 kJ/mol (J. Am. Chem. Soc. 1961, 83, 606-614): H H 1 Shown below are the lowest-energy conformations of compounds 1 and 2. Identify which drawing matches which compound, and identify which compound has the larger heat of combustion. H H H H |||I 2 H 4 H H The first drawing is compound 1, and compound 1 has a larger heat of combustion because it is the less stable compound. O The first drawing is compound 2, and compound 2 has a larger heat of combustion because it is the less stable compound. The first drawing is compound 2, and compound 2 has a larger heat of combustion because it is the more stable compound. The first drawing is compound 1, and compound 1 has a larger heat of combustion because it is the more stable compound.
- The images illustrate isomers of 1,2-di(2-methylpropyl)cyclohexane in conformational structures. Two are cis and two are trans. Indicate which is the more stable conformation for the cis and which for the trans, and indicate which of all the conformations is the most stable. H H. For each question, if both conformations of the isomer are equally stable, select both. Select the more stable conformation of cis-1,2-di(2-methylpropyl)cyclohexane. A ВWhich Newman projection represents the most stable conformation of 3-methylpentane when viewed down the 2-3 carbon-carbon bond? (A) Н HCCH2CH3 H H3C H (В) CH₂ H3CCH₂CH3 Н TH H (C) H офонасна CH3 H3C, H Н (D) на H3C Н Н CH₂CH3 CH3The following are all accurate Newman projections for compound X looking down the highlighted bond, but in different conformations. Which of the shown conformations is the lowest energy conformation of X? H. H CH3 CH3 (A) C(CH3)3 H (H3C)3C- H (B) Η, Η снанз X H3C (H3C)3C H3C (C) H H H. H3C H H3C (D) C(CH3)3 H
- Select the more stable conformation of cis‑1,2‑di(2‑methylpropyl)cyclohexane. A B C D Select the more stable conformation of trans‑1,2‑di(2‑methylpropyl)cyclohexane. A B C D Select the most stable conformation overall. A B C DWhat is the most stable chair conformation of the 4-methoxy-1,2- dimethylcyclohexane structure given below? A a B b с с D d OCH: "CH3 H3C 4-methoxy-1,2-dimethylcyclohexane OCH: OCH3 H3C H3C- H3C- OCH3 H3C -OCH3 ĆH: CH3 CH3 CH3 A B DFor each of the following reactions, draw the skeletal structure(s) of the most stable conformer for the major expected product(s) for the reaction. ОН KMNO4 a) Н2О/МеОН, 0°С OH Br Охопе Br b) Acetone/H20, 0° ОН OH KMNO4 c) Н2О/МeОН, 0°С OH