Table 6.

Ligand substituent effects on rearrangement.

Entry		R	R'	Yielda	Kf+rb	Kfb	Keq	ΔGexpc
11a	11b	OMe	OMe	59%	1.00 ± 0.03	1.00 ± 0.03	8.71 ± 0.15	−1.26 ± 0.01
12a	12b	OMe	Me	76%	-d	-d	0.19e	0.97 ± 0.01
31a	31b	H	H	77%	3.77 ± 0.54	0.87 ± 0.07	0.26e	0.78 ± 0.01
32a	32b	OMe	H	58%	-f	-f	10.0 ± 0.2	−1.34 ± 0.01
33a	33b	Me	H	35%	-f	-f	15.0 ± 0.3	−1.58 ± 0.01
34a	34b	H	Me	34%	-d	-d	0.01e	2.68 ± 0.01

^aIsolated yields; prepared in the same manner as in Table 2.

^bRelative to 11a in THF-d₈.

^cIn kcal/mol.

^dKinetics unreliable.

^eEstimated error is less than ± 0.01.

^fObtained at equilibrium.