Oligomer and Polymer Formation in Hexamethylcyclotrisiloxane (D3) – Hydrosilane Systems Under Catalysis by tris(pentafluorophenyl)borane

Siloxane‐Bond Formation Promoted by Lewis Acids: A Nonhydrolytic Sol–Gel Process and the Piers–Rubinsztajn Reaction

“…Heterocondensation between tetramethyldisiloxane and dimethoxydiphenylsilane in the presence of B(C 6 F 5 ) 3 . [56] NHSG has not been recognized as a tool for the synthesis of linear siloxane polymers. [53,56,57] In contrast to NHSG, the cleavage of the siloxane bond is observed not only for cyclosiloxanes but also for linear siloxanes.…”

Copolycondensation of Regular Functional Silane and Siloxane in Aqueous Emulsion Using B(C6F5)3 as a Catalyst

“…It has been reported in the literature that D 3 can be reopened by TPFPB, in the presence of Si-H functional silanes, in bulk or solution experiments. [22,23] Since the L 2 H is very rapidly consumed in this wet conditions, we suspect that only the TPFPB, or the Brönsted form of TPFPB with water, is able to open the strained cycle [23] and produce HO MDM OH which then further condense on themselves. [19] The generation of a complex between SiOH and TPFPB is known to extinct the natural fluorescence of TPFPB, [21] and produced ion-pairs because of preferred electrostatic interactions.…”

“…The group of Chojnowski has been particularly active in unraveling the TPFPB activity, in wet systems, of different reactions involving silanes, i.e., condensation [21] and dismutation, [22] and more recently those concerning the ring opening of hexamethylcyclotrisiloxane. [23] One key feature of the TPFPB is its water tolerance; not only the molecule does not degrade in water into inactive hydroxides, but also some catalyst remains, in confined location (for instance at oil/water interface) partly active, while most of the catalyst is engaged into a water complexation thus promoting a Brönsted acidity.…”

Green Polymerization of Hexadecamethylcyclooctasiloxane Using an Algerian Proton Exchanged Clay Called Maghnite-H+

“…We are interested in the polymerization of D8 (Scheme 1a) by Maghnite-H + . The polymerization of siloxane monomers was carried out previously by different catalysts as phosphazene bases [11,12], strong bases [13,14], dodecylbenzenesulfonic acid [15], triflic acid [16], tris(pentafluorophenyl)borane [17] and trifluoromethanesulfonic acid [18].…”