Hexane space-filling model

Figure 11.15 Four different representations of the structure of -hexane, C6H14. (a) is a three-dimensional representation showing all the atoms (b) reduces the structure to the carbon backbone, in which the hydrogens (three at each end and two at each joint ) are assumed to be present (c) is a two-dimensional representation and (d) is a space-filling model in which carbons are grey and hydrogens are white.

Fig. 26 Crystallographic packing in PhBABI (left), including solvated voids (right, solvent hexane and benzene shown as space-filling models).

Two more examples merit consideration. In 1,1-dimethylethylcyclo-hexane (25, -butylcyclohexane) the very bulky substituent group has an overwhelming preference for the equatorial position on account of its severe cis 1,3-diaxial interaction with two hydrogens when it is axial this can be verified with space-filling models. In effect, 25 is locked in the chair conformation with the 1,1-dimethylethyl group equatorial, incapable of inversion this substituent is discussed further in Chapter 6. 

Figure 2-3 Ball-and-stick (top) and space-filling molecular models of hexane, showing the zigzag pattern of the carbon chain typical of the alkanes. [Model sets courtesy of Maruzen Co., Ltd., Tokyo.]...

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