31250-00-7

Upstream product

• 31255-25-1 tetra-glycolic acid dichloride 
• 62-53-3 aniline 
• 13887-98-4 tetraglycolic acid 

Downstream Products

• 257890-33-8 C₂₀H₂₈N₂O₃ 
• 257890-51-0 1,13-bis(4-formylphenyl)-4,7,10,16,19,22-hexaoxa-1,13-diazacyclotetraeicosane 
• 257890-38-3 10,22-diphenyl-1,4,7,13,16,19-hexaoxa-10,22-diaza-cyclotetracosane-9,23-dione 
• 257890-48-5 1,13-diphenyl-4,7,10,16,19,22-hexaoxa-1,13-diazacyclotetraeicosane 

Relevant academic research and scientific papers

Unprecedented role of water in self-assembly of potential molecular tweezers

The X-ray structures of three potential molecular tweezers, C20H24N2O5 (1), C20H20N6O13 (2) and C28H32N2O13 (3), differing only by the substituents on the terminal aromatic moieties, display three as yet unreported arrays. Hydrogen bonding with co-crystallized water molecules as well as van der Waals interactions between terminal aromatic moieties lead to specific packing patterns, namely: (i) a membrane-like architecture of associated molecular tapes in 1 · 2H2O, (ii) coupled right- handed and left-handed helices in 2 · H2O and (iii) a stepped arrangement provided by a back-to-back pairing in (3)2 · H2O. Molecular modelling of individual molecules in vacuo shows that the most stable conformers of 1-3 intrinsically display attractive interactions between the terminal aromatic groups, which stabilize a pseudocavity suitable for incorporation of a guest compound.

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.