Restricted carbon–nitrogen bond rotation in some ureas, thioureas, and thiuronium salts
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 15,p. 2162-2165
- https://doi.org/10.1039/p29730002162
Abstract
Some NN-diaryl-N′N′-dimethylureas, their thio-analogues, and their S-methylthiuronium salts exhibit a kinetic phenomenon, observable by n.m.r. spectroscopy, which has a free energy of activation, ΔG‡ Tc, of between 40 and 70 kJ mol–1. The origin of this process, probably slow rotation about the C–NMe2 bond, is discussed in terms of the variation of ΔG‡ Tc with structure.Keywords
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