Action of elementary sulfur onto carbanions : a new route to dialkylpolysulfides

Thiol-End-Functionalized Polyethylenes

“…13,14 On the basis of this reaction concept, we envisioned the use of elemental sulfur (S 8 ) after the catalyzed polyethylene chain growth on magnesium. Boscato et al 15 reported that the reaction of a benzene solution of S 8 onto carbanions such as sec-butyllithium 16 was very fast and led to the precipitation of lithium polysulfides formed by a mechanism shown in Scheme 3 . The characterizations of the resulting organic products showed structures corresponding to sec-butyl-S x -sec-butyl with 1 < x < 5 when the stoichiometry of S 8 to the C-Li bonds was less than 1.…”

“…A proposed mechanism for the formation of polysulfurs PE-S k -PE (k < 8) by addition of S 8 onto PE-Mg-PE and based on the previous works of Boscato 15 is shown in Scheme 4.…”

Towards degradable polyethylene: end-functionalised polyethylene (PE-X) and PE-I/LDPE blends from iron-catalysed chain growth of ZnEt2 with ethylene

“…[69][70][71] . The reaction of main group alkyls with elemental sulfur has been known for some time and generally results in the formation of dialkyl polysulfides R-Sk-R. 72 3). Considering an chain length of C22 in this case, an average value of k = 4 could be calculated from elemental analysis (see Table S1).…”

Polymerizations with elemental sulfur: A novel route to high sulfur content polymers for sustainability, energy and defense

“…However, the generation of reaction side products (e.g., Li 2 S y , LiCl) was problematic since the removal of these byproducts increased the costs of the overall process. Boscato et al [47,48]and Catala et al [49][50][51] demonstrated a two-step copolymerization involving alkali metal initiated oligomerization of vinylic comonomers followed by reaction with sulfur ( Fig. 4d).…”