Polymerization of phenylacetylene catalysed by RhTp(cod) and RhBp(cod) in ionic liquids: effect of alcohols and of tetraammonium halides

Catalytic activity of a half-sandwich Ru(II)-N-heterocyclic carbene complex in the oligomerization of alkynes

“…Analysis of the reaction mixture with application of GC-MS and HPLC methods showed the presence of The addition of MeOH to the post reaction solutions, generally used to precipitate PPA from organic solvents, did not produce any changes, what proves an evidence against polyphenylacetylene (PPA) formation [21].…”

“…In some cases the reaction conditions have dramatic effect on the polymerization process. While [RhTp(cod)] and [RhBp(cod)] (Tp, tris-pyrazolylborate; Bp, bis-pyrazolylborate) are almost entirely inactive in CH 2 Cl 2 , they become good catalysts of phenylacetylene polymerization in ionic liquids [21].…”

Cationic Rhodium Complexes with Hemilabile Phosphine Ligands as Polymerization Catalyst for High Molecular Weight Stereoregular Poly(phenylacetylene)

“…However, there is not an obvious correlation between the length of the flexible chain (n) or the donor group (Z), and the catalytic activity or the molecular weight of the obtained polymers ( The solvent plays a decisive role in the polymerization reactions. 40,41 The catalytic activity of 5 is superior in toluene or in toluene/polar solvent mixtures but the polymers show bimodal molecular weight distributions. In contrast, the catalytic activity decreases when increasing the dielectric constant of the solvent but, interestingly, the polymers display unimodal GPC traces.…”

“…It is noticeable that catalytic systems based on rhodium complexes are, in general, tolerant with water. [40][41][42] We have found that the addition of water has a positive effect on the catalytic activity ( Figure 6) which can be rationalized in terms of a more facile proton transfer process but, at the same time, the termination step is also favored multiplying the number of different polymeric species giving broader GPC profiles.…”

Catalytic polymerization of phenylacetylene with dimeric [Rh(OMe)(cod)]2 complex in ionic liquids

“…15 The yield of PPA increased to 100% when alcohols [CH 3 OH, (CH 3 ) 2 CHOH or (CH 3 ) 3 COH] were added. 15 Combination of ionic liquids and/or ammonium salts with alcohols as reaction medium allowed higher-molecular-weight polymers to be obtained.…”