Models of cyclohexane

Figure 4.12 Representations of the chair conformation of cyclohexane (a) Carbon skeleton only (b) Carbon and hydrogen atoms (c) Line drawing (d) Space-filling model of cyclohexane. Notice that there are two types of hydrogen substituents—those that project obviously up or down (shown in red) and those that lie around the perimeter of the ring in more subtle up or down orientations (shown in black or gray). We shall discuss this further in Section 4.13.

Equilibrium data and thermodynamic modelling of cyclohexane gas hydrates. Chem. Eng Set. 51(1), 159-163. 

Fig. 2. Modified Fieser model of cyclohexane showing van der Waals domains of of C—H bonds...

Construct a model of cyclohexane by connecting 6 carbon atoms in a ring then into each remaining hole insert a connecting link (bond) and, if available, add a hydrogen to each. 

Cyclohexane achieves tetrahedral bond angles and staggered conformations by assuming a puckered conformation. The most stable conformation is the chair conformation shown in Figure 3-19. Build a molecular model of cyclohexane, and compare its shape... 

Make a model of cyclohexane and tty the ring inversion for yourself. 

S.Sd Skeletal structures of eycloalkanea imply that there La empty space in tho middle of the rings Use Spartan View to look at s pace-rilling models of cyclohexane, cyclo-decatke, and cycloocudecanc. Which, if any, rit have empty space ... 

As well as familiarity with a molecular model of cyclohexane, it is important to be able to present a good drawing this applies both to 14 and to the ring inverted form see Section 1.9). 

Make a model of cyclohexane and compare the boat and chair conformations. Use your model to explain why the chair conformation is more energetically favored. 

Build a model of cyclohexane, and convert it from one chair conformer to the other. To do this, pull the topmost carbon down and push the bottommost carbon up. 

This class experiment illustrates differences in the properties between the two types of chemicals. To help students make sense of what they are doing, encourage them to make models of cyclohexane (Figure 10.1) and cyclohexene (Figure 10.2). 

Kekul Baeyer model of cyclohexane. (Adapted from reference 57.)... 

When 66B is compared to the molecular model of cyclohexane (42B), the flattening of the ring is quite apparent. 

A) Molecular model of propane, C3Hg,a saturated,acyclic hydrocarbon. fSj Molecular model of cyclohexane, C6Hi2,a saturated,cyclic hydrocarbon. 

The chair-conformation model of cyclohexane reveals that the molecule has two types of hydrogens. Six carbon-hydrogen bonds are nearly parallel to the principal molecular axis (Figure 4-10) and hence are referred to as axial the other six are nearly perpendicular to the axis and close to the equatorial plane and are therefore called equatorial. ... 

You must be able to make a model of cyclohexane and put it in a chair conformation ... 

Make a model of cyclohexane in a chair conformation, and explain why the names axial and equatorial are appropriate. 

Building a molecular model will help you visualize many of the concepts being discussed in this section. Build a model of cyclohexane to convince yourself that the same Newman projection is obtained when the molecule is viewed along the other two pairs of parallel C —C bonds. 

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