Covalent adhesion; organic reactivity at a solid–solid interface through an inter-bead Diels–Alder reaction†

Diels–Alder reactions of anthracene, 9-substituted anthracenes and 9,10-disubstituted anthracenes

“…123 In another study, the thermal cycloaddition reaction of a 9,10-disubstituted anthracene derivative was used to investigate the possibility of inter-bead reactions of polystyrene resin beads. 124 The reactions of beads with bound 9,10-disubstituted anthracene and beads with bound maleimide were carried out in toluene and DMF. Aggregation of the beads was noted, showing an inter-bead cycloaddition reaction to have occurred.…”

Synthesis, analysis and study of sulfide-linked high functionality resin beads

“…(e) The surface contact area is small, estimated to be in the region where 10 4 molecules of the diene and dienophile components have the potential to undergo Diels-Alder reaction. 16 This was considered to be below the sensitivity range of instrumentation available to the authors at that time.…”

“…15 The second area addressed the possibility of pairwise chemical bonding at the interface between polymer beads, and methods for defining its occurrence. 16 Fuller discussion of both topics is provided in this paper.…”

Gel-phase HR-MAS 1H NMR spectroscopy as a probe for solid-tethered diimide rotaxanes and catenanes

“…Unfortunately, inter-bead attachment cannot be distinguished from intra-bead attachment using normal solid-phase analytical methods, such as HR-MAS NMR spectroscopy and at this time the authors are aware of only one other reported example of a reaction resulting in some evidence for inter-bead attachment. 17…”