Table 2. Formation Experiments of Cage 5 in Different Solvents with and without Addition of TFA^a.

^aReaction time: 2 days; reaction temperature: room temperature.

^bCalculated from ¹H NMR spectrum with the addition of 1,3,5-trimethoxabenzene as standard.

^cSum of amount of cage 5 of precipitate and mother liquor.

^dNo precipitate observed after reaction.