Table 5.

Solvent effect on rate constant^a

Solvent	Dielectric Constant	[BEt3]	[1a]	kobs (s−1)
C6D6	2.2521	419 mM	21.1 mM	3.33(1) × 10−3
THF-d8	7.4722	419 mM	23.2 mM	5.77(5) × 10−3
75% o-C6H4F2 +25% C6D6	11.26b	419 mM	24.5 mM	2.57(3) × 10−3

^aMonitored at 40 °C. These experiments were performed without mercury, and therefore the rate constants differ slightly from those in Table 4.

^bThe dielectric constant for the mixed solvent is estimated as the weighted average of 14.26 (pure o-C₆H₄F₂)²³ and 2.25 (pure C₆D₆).