31255-22-8

Upstream product

• 929-75-9 2-[2-[2-[2-aminoethoxy]ethoxy]ethoxy]ethylamine 
• 19249-03-7 triethylene glycol di-(p-toluenesulfonate) 
• 31364-40-6 4,7,10,16,19,24,27-heptaoxa-1,13-diaza-bicyclo[11.8.8]nonacosane-14,21-dione 
• 31255-20-6 1,4,7,13,16-pentaoxa-10,19-diaza-cycloheneicosane-11,18-dione 
• 23978-10-1 kryptofix 23 
• 31255-09-1 3,6-dioxa-1,8-octanoyl dichloride 

Relevant academic research and scientific papers

The most convenient method for the preparation of aliphatic cryptands

An important new one-step method for the preparation of aliphatic cryptands from available oligoethyleneoxydiamines and ditosylates is reported.

Alkaline Earth Cryptates: Dynamics and Stabilities in Different Solvents

The stability constants and rates of formation and dissociation of alkaline earth cryptates with (2,1,1), (2,2,1), (2,2,2), (2B,2,2), and (2B,2B,2) have been measured in several solvents.The stability constants, Ks, are considerably larger and display higher selectivity than those of the monocyclic crown and diaza crown ethers and anionic ionophores.Values of Ks vary by over 10 orders of magnitude in the different solvents, increasing in the order Me2SO d).The rates show no correlation with solvent exchange rates, and are sensitive to cation size, cation-solvent interactions, and ligand flexibility.In strongly solvating media such as Me2SO, rates are up to 106 lower than predicted by a simple Id mechanism.The results suggest that the complexation reaction involves essentially stepwise replacement of solvent by ligand donor atoms, but that even for relatively flexible macrocyclic ligands compensation for loss in solvation by ligand binding energy in the transition state is not complete.

Complexes of macrocyclic compounds

Novel macrocyclic (monocyclic and bicyclic) compounds having nitrogen bridgehead atoms and having in the hydrocarbon bridging chains at least two additional hetero atoms selected from the group consisting of sulfur, oxygen, and nitrogen, when admixed with a compatible cation-donor compound form stable cation-containing macrocyclic complexes which, in turn, can be conveniently dissociated by addition of acid or a quaternizing agent. The novel macrocyclics are valuable for use in the same way and for the same purposes as chelating agents.