Tetrahedron Letters p. 4787 - 4790 (1997)
Update date:2022-08-05
Topics:
Um, Ik-Hwan
Chung, Eun-Kyung
Kwon, Dong-Sook
The Hammett plots obtained for the title-reactions exhibit a break, i.e. ρ acyl values decrease from 2.21 ~ 2.44 to 1.45 ~ 1.52 as the acyl substituent becomes a strong electron withdrawing group (σ > 0.6). Such a break in the Hammett plots is suggestive of a change in the reaction mechanism and strong evidence of a stepwise mechanism for the acyl-transfer reaction.
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