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. 2025 Feb 13;90(8):3110–3115. doi: 10.1021/acs.joc.4c03080

Table 2. Hammett Constants (ρ) and Estimated Charges (ξ) at the TRSs in Acetonitrile.

reaction system	ρ	ρ(K_H^–)^a	estimated charge at TRS (ξ)^b	TRS
DMPBIH/GPhXn⁺	1.05^a	4.59	+0.77 on PhXn	tight
DMPBIH/GPhTXn⁺	0.71^a	6.12	+0.88 on PhTXn	loose
MPH/GPhXn⁺	0.76	4.59	+0.83 on PhXn	tight
MPH/GPhTXn⁺	0.41	6.12	+0.93 on PhTXn	loose
MAH/GPhXn⁺	0.96^a	4.59	+0.79 on PhXn	tight
MAH/GPhTXn⁺	0.57^a	6.12	+0.91 on PhTXn	loose
BAH/GPhXn⁺	0.93	4.59	+0.80 on PhXn	tight
BAH/GPhTXn⁺	0.44	6.12	+0.93 on PhTXn	loose
HEH/GPhXn⁺	2.15^a	4.59	+0.53 on PhXn^c	tight
HEH/GPhMA⁺	0.61^a	5.93	+0.90 on PhMA^c	loose
BNAH/GPhXn⁺	2.65	4.59	+0.42 on PhXn^c	tight
BNAH/GPhMA⁺	0.66	5.93	+0.89 on PhMA^c	loose

^a

From ref (47).

^b

See the text.

^c

For the assumed reactions with PhXn⁺/PhMA⁺ only.