Cycloalkanes calculating strain energy

Figure 4.3 Cycloalkane strain energies, calculated by taking the difference between cycloalkane heat of combustion per CH2 and acyclic alkane heat of combustion per CH2, and multiplying by the number of CH2 units in a ring. Small and medium rings are strained, but cyclohexane rings are strain-free.

Strain energies (kcal mol 1) of cyclic ketones and cycloalkenes relative to cycloalkanes from force-field calculations... 

Fig. 25 Idealised EM-profiles calculated extrathermodynamically from (67) for reactions series whose transition states or products have a constant fraction a of the cycloalkane strain energies (see also Fig. 26)...

FIGURE 4.3 Cycloalkane strain energies, calculated from thermodynamic heats of formation. Small and medium rings are strained, but cyclohexane rings are strain-free. 

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