Separation of pyrrolidine from tetrahydrofuran by using pillar[6]arene-based nonporous adaptive crystals

Abstract

Pyrrolidine, an important feedstock in the chemical industry, is commonly produced via the vapor-phase catalytic ammoniation from tetrahydrofuran (THF). Obtaining pyrrolidine with high purity and low energy cost has extremely...

Chromatographic Separation of Aromatic Amine Isomers: A Solved Issue by a New Amphiphilic Pillar[6]arene Stationary Phase

“…P­[ n ]­As possess a highly symmetrical and rigid cavity structure that can be easily functionalized, showing a versatile solubility and high chemical and thermal stabilities. , P­[ n ]As show a selective interaction with specific guests through dispersion, π–π, dipole–dipole, and shape-fitting in their host cavities . In the past decade, P­[ n ]As have been widely investigated in supramolecular chemistry and materials chemistry due to their involvement in supramolecular assemblies, nanoparticle synthesis, catalysis, drug delivery, sensors, and so on. − Furthermore, numerous applications of P­[ n ]As as adsorbent, stationary phase, and membrane have been reported in the field of separation science. − A series of pillararene-based nonporous adaptive crystals (NACs) have shown great potential in the separations of various hydrocarbons, dichlorobenzene and difluorobenzene isomers, aliphatic amines, aromatics/cyclic aliphatic mixtures, l -pentene isomers, etc. − The success of P­[ n ]As in analytical chemistry can be attributed to their highly symmetric pillar structure with π-electron-rich cavities and excellent host–guest recognition properties toward matched guests, providing unique intermolecular interactions. All of these works encourage the development of P­[ n ]­As as a novel class of stationary phases with high selectivity for GC analysis.…”

Efficient Purification of 2,6-Lutidine by Nonporous Adaptive Crystals of Pillararenes

“…Moreover, pillararenes can be easily functionalized for the uptake of specific guests. Benefiting from the above characteristics, our group and other groups have developed NACs of pillararenes and their analogues for efficient adsorptive separations of various chemical feedstocks. − To the best of our knowledge, such materials have not been reported for the purification of 2,6-LT .…”

Pillar[n]arene–calix[m]arene hybrid macrocyclic structures

“…Among them, cyclophanes 19–21 with repeated aromatic moieties, such as pillar[ n ]arene 22–28 and calix[ m ]arene 29–34 (Scheme 1), have attracted considerable academic and practical attention. 35 For example, owing to the presence of multivalent modification sites, 36 the structural skeletons of both pillar[ n ]arene and calix[ m ]arene could be directly used as the backbone for embedding valuable functional groups for various applications to water-soluble 37 self-assembled amphiphiles, 38–41 advanced hierarchical architectures, 42,43 such as metal organic frameworks, 44–48 as well as energy storage and batteries. 49,50…”

“…advanced hierarchical architectures, 42,43 such as metal organic frameworks, [44][45][46][47][48] as well as energy storage and batteries. 49,50 Actually, owing to the presence of similar aromatic oligomeric structures, the development of novel structures and applications of pillar[n]arene 51 has always resembled those of calix[m]arene.…”