Substituent effects for the N- and O-aryl groups on rate and equilibrium constants for the system ArO–+ Ar′NCS⇌ ArOCS![[N with combining macron]](https://www.rsc.org/images/entities/char_004e_0304.gif)
Ar′ in aqueous solution lead to identical Leffler–Grunwald parameters (α=βF/βEQ) despite the marked difference in the individual β values; the α-parameter is therefore a good measure of transition-state structure for the reaction.
S. V. Hill, S. Thea and A. Williams, J. Chem. Soc., Chem. Commun., 1982, 547 DOI: 10.1039/C39820000547
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