Experimental and theoretical examination of intramolecular motions in N-(4-X-naphthalen-1-yl)-N-ethyl-4′-methyl-benzenesulfonamides-Science-Chemical Encyclopedia-lookchem

Experimental and theoretical examination of intramolecular motions in N-(4-X-naphthalen-1-yl)-N-ethyl-4′-methyl-benzenesulfonamides
Add time:08/14/2019 Source:sciencedirect.com

The title compounds undergo rotations around three sterically crowded single N bonds. At ambient temperature the torsion angles between phenyl, naphthyl rings and ethyl group are 80° and methylene protons show general behavior of an AB spin system. At high temperature three main parts of molecule are located in one plane and methylene protons show an A2 spin system. This situation is reflected in negative entropies of activation.

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