A macrocyclic aromatic thioether ketone: synthesis, structure and anionic ring-opening polymerisation

Recent advances in entropy-driven ring-opening polymerizations

“…The ring-strain energy was equal for 12-and 13-membered rings, but the rate of propagation was higher for the larger ring, which the authors assigned to the difference in s-character of carbon atomic orbitals on the basis of NMR coupling constants. 5 Other groups of macrocycles polymerizable via anionic mechanism include ether ketones, 58,59 ether sulfones 20 and aromatic thioethers, 60 although the latter ones undergo also thermally initiated free radical polymerization. 8a,c,61 The anionic polymerization of cyclic ethers and their derivatives is initiated by CsF or alkali phenoxides.…”

Polymers and Sulfur: what are Organic Polysulfides Good For? Preparative Strategies and Biological Applications

“…Only a few exceptions can be found: for example, the use of nitro groups, instead of halogens, which is possible when the presence of electron‐withdrawing groups, such as perfluorinated chains, allows their nucleophilic replacement64 (Example I in Table 1). To our knowledge, only one alternative synthetic process has been employed: the ring‐opening polymerization of cyclic oligomers that are generated as byproducts in the step polymerization 65…”

Novel thermo-sensitive hydrogels containing polythioether dendrons: facile tuning of LCSTs, strong absorption of Ag ions, and embedment of smaller Ag nanocrystals

“…Although oligomeric cyclic polythioethers possess excellent chelating ability, their preparation usually suffers from relatively low yield. [21][22][23] Thus, polythioethers of novel structures should be developed to enhance the yield.…”