Concept explainers
Interpretation:
The rotational energy barrier on going from the anti conformation to one of the gauche conformations is to be indicated in Figure
Concept introduction:
The rotational energy barrier is the energy difference between the beginning conformation and the highest-energy conformation through which the molecule must pass to arrive at the ending conformation.
In Newman projection formula, when the hydrogen on the front carbon covers the hydrogen on the rear carbon, such conformation is called eclipsed conformation, and when the hydrogen atom on the front carbon bisects a pair of
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ORGANIC CHEMISTRY E-BOOK W/SMARTWORK5
- Increased substitution around a bond leads to increased strain. Take the four substituted butanes listed below, for example. For each compound, sight along the C2-C3 bond and draw Newman projections of the most stable and least stable conformations. Use the data in Table 3-5 to assign strain-energy values to each conformation. Which of the eight conformations is most strained? Which is least strained? (a) 2-Methylbutane (b) 2,2-Dimethylbutane (c) 2,3-Dimethylbutane (d) 2,2,3-Trimethylbutanearrow_forwardFrom the data in Figure 4-12 and Table 4-1, estimate the percentages of molecules that have their substituents in an axial orientation for the following compounds: (a) Isopropylcyclohexane (b) Fluorocyclohexane (c) Cyclohexanecarbonitrile, C6H11CNarrow_forwardHow many stereoisomers are possible for the molecule formed by the reaction described in the preceding question? Group of answer choices a. 8 b. 16 c. 32 d. 64 (preceding question is image #2)arrow_forward
- Consider the molecule 1-bromo-2-methylbutane. C3 and C4 should be drawn as Et as in theexample. This group is called an ethyl group and can be considered a sphere about twice the sizeof a methyl group. Draw the following Newman projections sighting down the C1C2 bond... a. The lowest potential energy conformation. b. The highest potential energy staggered conformation.arrow_forwardDraw the most stable conformation of pentane, using wedges and dashes to represent bonds coming out of the paper and going behind the paper, respectively.arrow_forwardPlease state which conformation is most unstable, thank youarrow_forward
- I still don't know in which direction (axial or equatorial) the hydrogens are in both chair conformations of MCHM. Can you please draw the two conformations including the hydrogens?arrow_forwardCalculate strain energy for the conformed pictured below, using strain energy increments from the table.arrow_forwardPlease help me with my conformations assignment! Thank you!!arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning