Ring Flip
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ring flipping (also known as ring inversion or ring reversal) is a phenomenon involving the interconversion (by rotation) about single bonds of cyclic conformers having equivalent ring shapes but not necessarily equivalent spatial positions of substituent atoms. The six-membered ring of the alkane, cyclohexane, has the ''chair'' as its preferred conformation and through proton NMR it would be expected that the produced spectrum would show the different sorts of…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ring flipping (also known as ring inversion or ring reversal) is a phenomenon involving the interconversion (by rotation) about single bonds of cyclic conformers having equivalent ring shapes but not necessarily equivalent spatial positions of substituent atoms. The six-membered ring of the alkane, cyclohexane, has the ''chair'' as its preferred conformation and through proton NMR it would be expected that the produced spectrum would show the different sorts of protons (axial and equatorial) resonating at different frequencies, and so two signals would be seen, due to the protons being in slightly different chemical environments. However, only one signal can be seen as the two isomers are rapidly interconverting. This also occurs with monosubstituted cyclohexanes. This changes with the use of low temperature, as the two isomers visible interconvert much more slowly than at room temperature.