Table 7. Basicities of selected carb- and silyl anions.

Base	pK a a	Base	GPB [kcal mol–1]
Me3CLi	>50 b	Me3C–	–396.6 h
(Me3Si)3CCs	36.8 c , d	(Me3Si)3C–	–355.1
1– [Na-2,2,2-crypt]+	29.2 c	1–	–348.8
K-1	24.5 c	K-1	–280.6
Me3Si–	44.9 e	Me3Si–	–376.2 h
(Me3Si)3SiLi	29.4 f	(Me3Si)3Si–	–349.3
2– [K-2,2,2-crypt]+	26 ± 1 g	2–	–339.7
K-2	22.3 c	K-2	–278.9

^a The calculated pK _a values refer to the conjugated acids.

^b Extrapolated.

^c Measured in THF.

^d Taken from ref. 24.

^e Calculated for THF as solvent, ref. 25.

^f Measured in diethyl ether, ref. 22.

^g Measured in C₆D₆.

^h Taken from ref. 26.