Table 1.

Solvent effects on the cyclization of (E:Z)-1 with (EtPPPEt)Pt^{2+ a}

Entry	Solvent	Keq (A:B)b	ΔG (kcal/mol)
1	CH2Cl2c	60 (1:2)	−2
2	ClCH2CH2Clc	110 (1:3)	−2.8
3	EtNO2	3.2 (4:1)	−0.69
4	MeNO2	0.68 (14:1)	0.23

^aConditions: [Pt] = 0.027 M, [Ph₂NH₂][BF₄] = 0.27 M, [1] = 0.27 M, 25(1)° C (see Supplementary Material).

^bRelative concentrations determined by ³¹P NMR. Average of three measurements.

^c[Pt] = 0.012 M.