%0 Journal Article %A Gareyev, Roustam %A Streitwieser, Andrew %D 1996 %T Lithium and Cesium Ion-Pair Acidities of Some Terminal Acetylenes and Aggregation in Tetrahydrofuran1 %U https://acs.figshare.com/articles/journal_contribution/Lithium_and_Cesium_Ion-Pair_Acidities_of_Some_Terminal_Acetylenes_and_Aggregation_in_Tetrahydrofuran_sup_1_sup_/3700848 %R 10.1021/jo951243q.s001 %2 https://acs.figshare.com/ndownloader/files/5791290 %K concentration %K aggregation number %K EA %K triphenylpropyne %K EB %K 1.2. Cesium acidities %K TPP %K THF %K aggregated %K ethynyladamantane %K equilibrium lithium acidities %X The equilibrium lithium acidities in THF have been determined for 4-ethynylbiphenyl, EB (pK 21.5−22.3), 3,3,3-triphenylpropyne, TPP (pK 22.3−22.7), and 1-ethynyladamantane, EA (pK 23.7). Ion pairs of (4-ethynylbiphenylyl)lithium are aggregated in the concentration range from 10-4 to 10-3 M, with an average aggregation number of 2.5. (3,3,3-Triphenylpropynyl)lithium ion pairs are partially aggregated at concentrations from 10-5 to 10-3 M; the average aggregation number is 1.2. Cesium acidities in THF have been determined for 3,3,3-triphenylpropyne (pK 29.1−29.9) and 1-ethynyladamantane (pK 31.56). The average aggregation number of (3,3,3-triphenylpropynyl)cesium ion pairs is 6.2 at concentrations of 10-4−10-3 M. %I ACS Publications