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.Given each of the IUPAC names provided, draw the corresponding structure. (a) 2-cyclopropoxypentane;(b) 1,2-dimethoxy-4-propylcyclohexane; (c) 4-(1,1-dimethylethyl)-1,2-dipropoxycyclooctaneWrite 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 ОНRead Appendix B on naming branched alkyl substituents, and draw all possible alkyl groups having the formula C5H11–. Give the IUPAC names for the eight compounds of molecular formula C10H20 that contain a cyclopentane ring with each of these alkyl groups as a substituent.Explain the role strain plays on stability and reactivity of a cyclic alkane such as cyclopropane.
- Draw 1,2,3,4,5,6-hexamethylcyclohexane with the methyl group (a) in equatorial positions.Provide the correct IUPAC name for the skeletal (line-bond) structure shown here. Stereochemistry is ignored. 4-iso-3,3-dimethyl non eneWrite structural formulas for all ketones with the molecular formula C6H12O and give each its IUPAC name. Which of these ketones are chiral?
- Why is a 1, 3 - cis disubstituted cyclohexane more stable than its trans isomer?When cyclopropane is treated with HI, 1-idopropane is formed. A similar type of reaction does not occur with cyclopentene or Cyclohexane. Suggest an explanation for cyclopropane’s reactivity.Draw six isomeric cyclopentanes of molecular formula C7H14. These will include four constitutional isomers, of which two show geometric (cis-trans) stereoisomerism.