CHM 203 Chapter Notes - Chapter 4: Steric Effects, Stereoisomerism, Cyclopentane

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4. 1 names and physical properties of cycloalkanes. Naming them: add a cyclo- before the alkane name. Monosubstituted systems the methyl is always attached to the first carbon of the ring. Polysubstituted systems the methyls should be attached to the carbons which will ensure a low number difference. Cycloalkyl radicals radicals created after the removal of a hydrogen atom. Properties of cycloalkanes: cycloalkanes have higher boiling and melting points, have higher densities. Also even numbered cycloalkanes have different melting points to odd numbered cycloalkanes. 4. 2 ring strain and the structure of cycloalkanes. Ring strain the difficultness that comes from closing the ring without breaking the bonds due to a significant (cid:272)ha(cid:374)ge fro(cid:373) (cid:374)or(cid:373)al li(cid:374)ear a(cid:374)gles ((cid:1005)(cid:1004)9. (cid:1009) to so(cid:373)e other angle); a mixture of torsional and bon-angle strain. Yet it does(cid:374)"t: the difference is due to ring strain, researchers classify rings by small (3,4), common (5, 6, 7), medium (8-

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