Facile one-step synthesis of 5-silaspiro[4.4]nona-2,7-diene

(Polystyrylbipyridine)(tetracarbonyl)tungsten. An active, reusable heterogeneous catalyst for metathesis of internal olefins

“…Identification of 3-hexene was made by comparing its IR, NMR, and mass spectra with those of the authentic material after fractional distillation (45-68 °C) of the product. Identification of 2-butene was made using a fraction (bp [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] °C) which also contained the starting 2-pentene.…”

Catalytic cyclometalation reaction of unsaturated compounds in synthesis of magnesa- and aluminacarbocycles

“…Introduction to synthetic practice in 1972 of highly active Mg* (Rieke magnesium) [188] allowed direct metalation of buta-1,3-diene without preliminary chemical activation of magnesium. Buta-1,3-diene reacts with Mg* at room temperature to give the butadiene-magnesium reagent (MgC 4 H 6 ) n 132, which vigorously react with SiCl 4 yielding 5-silaspiro-4,4 0 -nona-1,7-dien 143 [189].…”

Chemical Kinetics and Hot Atom Chemistry — Present Status and Future Perspectives

“…The synthesis of authentic materials, of course, made possible the identification of the l-sila-3-cyclopentene [203] and the silaspirononadiene [204] shown above. The finding that this silacyclopentene can be formed in high yield can be seen that methylsilane is 1.12 to 1.35 times as reactive as silane in producing the products expected from silylene insertion into a silicon-hydrogen bond.…”