Measurement of Angle Strain
A quantitative measure for angle strain is strain energy. Angle strain and torsional strain combine to create ring strain that affects cyclic molecules. These measurements commonly use heat of combustion.
- CnH2n + 3/2 n O2 → n CO2 + n H2O + n X
where X is the heat of combustion for a CH2 group (energy per CH2).
Normalized energies that allow comparison of ring strains are obtained by measuring per methylene group (CH2) of the molar heat of combustion in the cycloalkanes.
The reference value is 658.6 kJ per mole of methylene group. The reference value was obtained from an unstrained long-chain alkane.
In cyclohexane the total ring strain is 0 kJ.
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