Provide an explanation for the surprising fact that all-trans-1,2,3,4,5,6-hexaisopropylcyclohexane is a stable molecule in which all isopropyl groups are axial.
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Provide an explanation for the surprising fact that all-trans-1,2,3,4,5,6-
hexaisopropylcyclohexane is a stable molecule in which all isopropyl groups are axial.
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- It is easy to imagine a cyclohexane as a flat hexagon and a lot of the time we draw it that way. Looking at 1,3,5-triethylcyclohexane we cannot tell the stability of the molecule from looking at the flat 2D drawing. Explain why we need to look at the 3D configuration and what conformation (axial,equatorial) would each of the three ethyl groups be in for the most stable configuration.Write a conformational structure for 1,2,3-trimethylcyclohexane in which all the methyl groups are axial and then show its more stable conformation.Name the heterocyclic substituent found in the molecule shown according to the general type of nitrogen-containing ring to which it belongs. NH2 O- O=P-0-CH2 `N' O. O- нн H ОН ОН
- Write the structures of two chair conformations of 1-tert-butyl-1-methylcyclohexane. Which conformation is more stable?Draw the most stable structure of cis-1-tbutyl-2-methylcyclohexane. Your structure should clearly distinguish between axial and equatorial positions.(a) which if the structure of trans-1,2-dimethylcyclopentane? (b) which is the most stable conformation of 1-bromo-2-ethylcyclohexane? (c) which is the least stable conformation of 1-bromo-2-ethylcyclohexane? (d) which is the more stable configuration of 1,3-dimethylcyclopentane? *Et = ethyl
- How many unique stereoisomers exist for 1,2,3,4,5-pentachlorocyclohexane?Give the extended, condensed, and bond line structural formula, and the type of aliphatic hydrocarbon of the following compounds: 2-ethyl-1,1,4,4-tetramethylcyclohexane trans-5-ethyl-2-heptene 2,4-difluoro-5-methyl-6-propylnonane 5,6-dimethyl-2-octyneDraw six isomeric cyclopentanes of molecular formula C7H14. These will include four constitutional isomers, of which two show geometric (cis-trans) stereoisomerism.
- When cyclohexane is substituted by an ethynyl group, -C=CH, the energy difference between axial and equatorial conformations is only 1.7 kJ (0.41 kcal)/mol. Compare the conformational equilibrium for methylcyclohexane with that for ethynylcyclohexane and account for the difference between the two.Stereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the structure of a compound that is a stereoisomer of trans-1,4-dibromocyclohexane cis-1,2-dimethylcyclobutane cis-1,3-dimethylcyclobutaneBoth 1,2-dihydronaphthalene and 1,4-dihydronaphthalene may be selectively hydrogenated to 1,2,3,4-tetrahydronaphthalene.One of these isomers has a heat of hydrogenation of 101 kJ/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kJ/mol (27.1 kcal/mol). Match the heat of hydrogenation with the appropriate dihydronaphthalene.