Platinum-Catalyzed Reactions of Silacyclobutanes and 1,3-Disilacyclobutanes

Persistent Bissilylated Arenium Ions

“…Compound 2 a :70 Colorless oil; yield: 4.53 g (19.2 mmol, 96 %); 1 H NMR (250 MHz, [D 1 ]chloroform, 300 K, δ 1 H(CHCl 3 )=7.24): δ =7.50 (m, 2 H; H aryl ), 7.35 (m, 3 H; H aryl ), 3.83 (sept, 3 J (H,H)=3.6 Hz, 1 H; SiH), 1.50–1.35 (m, 2 H; C 1 H 2 ), 0.90–0.80 (m, 2 H; C 2 H 2 ), 0.70–0.59 (m, 2 H; C 3 H 2 ), 0.25 (s, 6 H; SiMe 2 Aryl), 0.03, (d, 3 J (H,H)=3.6 Hz, 6 H; Si(CH 3 ) 2 H); 13 C NMR (62.90 MHz, [D 1 ]chloroform, 300 K, δ 13 C(CDCl 3 )=77.0): δ =139.7 (C ipso ), 133.5 (C ortho ), 128.7 (C para ) 127.6 (C meta ), 19.8 (C 1 ), 18.9 (C 2 ), 18.6 (C 3 ), −3.0 (Si( C H 3 ) 2 aryl), −4.4 (SiH( C H 3 ) 2 ); 29 Si NMR (79.495 MHz, [D 1 ]chloroform, 300 K, δ 29 Si((H 3 C) 2 SiHCl)=11.1, ext. ): δ =−4.1 (br s, 1 J (Si,C alkyl )=52 Hz; Si(CH 3 ) 2 Aryl), −14.5 (dm, 1 J (Si,H)=188.0 Hz, 2 J (Si,H)=7 Hz; Si(CH 3 ) 2 H).…”

Synthesis of polycarbosilanes having a five‐membered cyclic carbonate structure and their application to prepare gel polymer electrolytes for lithium ion batteries

“…A silacyclobutane bearing five‐membered cyclic carbonate (SBMC) was designed and synthesized as a key monomer to obtain polycarbosilanes applicable for the GPE, because it is well known that four‐membered silacarbocycles are easily polymerized by various transition metal catalysts13–17 to give thermally and chemically stable poly(silatrimethylene)s. In addition, it is easy to introduce a wide variety of functional groups on the silicon atom. The synthetic route of SBMC is depicted in Scheme .…”

Catalytic synthesis and characterization of stereoregular and optically active polycarbosilanes

“…In the 29 Si spectrum, only one sharp signal was observed at ¡10:53 ppm, which was assigned to the dialkyldiaryl-substituted silicon atom [27]. This indicates that the repeating unit of the polymer is precisely controlled as head-to-tail sequence.…”

“…Several reports have appeared on transition-metal-catalyzed ROP of the strained cyclic carbosilane using Rh, Pt and Pd [28][29][30][31][32]. ROP of 1,1-diphenyl-2,3-benzosilacyclobut-2-ene, an analogue of 7, with Pt complexes at 80 ± C was reported by Watt and co-workers [32].…”