Table 2. Computed Free Energies (ΔG) for the Association of the Counteranion with the Activated Dienophile To Form the CIPs Si-1a···5a and Si-1b···5b in Solution^a.

	CIP
	RA		RB
	2a-1	2a-2	2b-1	2b-2
ΔGb,c	–26.3	–24.6	–25.4	–24.6
ΔE	–82.6	–79.5	–78.9	–77.3
ΔEgeo-prep	4.3	4.1	12.4	9.0
ΔEint	–86.9	–83.6	–91.3	–86.3
Edisp	–36.4	–33.8	–35.4	–35.5
ΔEno-disp	–50.5	–49.8	–55.9	–50.8

^aThe ΔG values are also decomposed using the LED scheme (eq 3). All energies are in kcal mol^–1.

^bReaction RA at 25 °C.¹⁵

^cReaction RB at −40 °C.¹⁶