CHEM 227 Chapter 4: Chapter 4 Book Notes
31 Jul 2016
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Document Summary
Saturated cyclic hydrocarbons are called cycloalkanes-an alkane that contains a ring of carbons. Larger cycloalkanes have increasing rotational freedom, and very large rings ( and up) are so oppy that they are nearly indistinguishable from open-chain alkanes. The common ring sizes , however, are severely restricted in their molecular motions. There are two different 1,2-dimethylcyclopropane isomers, one with the methyl groups on the same face of the ring (cis) and the other with the methyl groups on opposite faces of the ring (trans). Stability of cycloalkane: smaller and larger ring sizes exhibit angle strain. The strain introduced into a molecule when a bond angle is deformed from its ideal value(109. 5). Angle strain is particularly important in small-ring cycloalkanes, where it results from compression of bond angles to less than their ideal tetrahedral values. The higher the strain a cycloalkane compound has the more energy (heat) will be released by combustion.
