Fig. 5: Reactivity studies of [K(DME)]⁺3ˉ.

Condition (i) reagent: 10 equiv. of ^tBuCl; solvent: THF; reaction temperature (time), 50 °C (30 min). (ii) reagent: 2.4 equiv. of (IDipp)CuCl; solvent: THF; reaction temperature (time), −30 °C (10 min). (iii) 1) reagent: 1.2 equiv. of Ad-N₃ (Ad = adamantyl); solvent: THF; reaction temperature (time), −30 °C (10 min); 2) crystallization with 18-crown-6. (iv) 1) reagent: excess of N₂O; solvent: THF; reaction temperature (time), room temperature (10 min). 2) reagent: 1.0 equiv. of 18-crown-6; solvent: THF; reaction temperature (time), room temperature (10 min). (v) reagent: 1.0 equiv. of silver triflate (AgOTf); solvent: THF; reaction temperature (time), −30 °C (1 h). (vi) 1) reagent: 1.5 equiv. of PhCCPh; solvent: toluene; reaction temperature (time), room temperature (16 h); 2) reagent: 0.9 equiv. of [2.2.2]cryptand; solvent: pentane; reaction temperature (time), room temperature (10 min).