Adhikari, Birendra Babu published the artcileAllosteric effect of the first lead ion on stepwise extraction of the second lead ion with p-t-butylcalix[5]arene pentacarboxylic acid derivative, COA of Formula: C12H16O3, the publication is Tetrahedron Letters (2010), 51(27), 3481-3485, database is CAplus.
A calix[5]arene-based solvent extraction reagent displaying very high selectivity for lead has been prepared, one mol. of which extracts two lead ions in a stepwise manner. The first Pb2+ ion is bound to five phenoxy oxygen atoms inside the calixarene cavity due to which the ligand undergoes conformational freezing in stable cone conformer. This causes pos. allosteric effect for co-extraction of the second lead ion due to the aggregation of functional groups.
Tetrahedron Letters published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, COA of Formula: C12H16O3.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia