In situ catalyst systems for ring-opening metathesis polymerization

Versatility of radical coupling in construction of topological polymers

“…In the past several years, "living"/controlled polymerization mechanisms, such as living anionic polymerization, 1-10 nitroxide mediated radical polymerization (NMRP), [11][12][13][14] atomtransfer radical polymerization (ATRP), [15][16][17][18][19][20] reversible addition fragmentation transfer polymerization (RAFT), [21][22][23][24][25][26][27][28][29] single electron transfer living radical polymerization (SETLRP), [30][31][32][33][34][35][36] ringopening polymerization (ROP) [37][38][39][40][41][42][43] and ring-opening metathesis polymerization (ROMP), [44][45][46][47][48][49] have been developed and widely used in polymer science. Usually, a certain polymer with complicated topological structure or composition could not be obtained by adopting a single polymerization mechanism or a simple combination of several mechanisms.…”

Synthesis and ROMP activity of aminophenol-substituted tungsten(VI) and molybdenum(VI) complexes

“…Similarly, the costs of well-defined Ru alkylidene complexes [3] represent an important disadvantage for their practical application. On the other hand, a number of relatively cheap Mo(VI) and W(VI) complexes with labile ligands can be activated by main-group organometallics to obtain active catalysts [4][5][6]. It is assumed that the main role of these activators consists in the substitution of two labile ligands on a transition metal with alkyl groups.…”

Synthesis and structure of stable cis-dimethyl complex of oxotungsten(VI)

“…A number of tungsten(VI) complexes with labile ligands can be activated by main-group organometallics to obtain active catalysts for olefin metathesis [1][2][3][4]. It is assumed that the main role of these activators is to substitute two labile ligands on tungsten with alkyl groups.…”