Detail of "6476-36-4"

Reference

Catalytic cleavage of the Si-Si bond of methylchlorodisilanes with nucleophiles: evidences for a stabilized silylene reaction intermediate

Some chemicals with cas registry numbers like 6476-36-4 and 101-02-0 are also used. Catalytic cleavage of the Si-Si bond of methylchlorodisilanes with nucleophiles: evidences for a stabilized silylene reaction intermediate. Garcia-Escomel, Cristina; Mekarbane, Pierre; Martin, Christine; Grenouillet, Pierre; De Bellefon, Claude (ESCPE Lyon, UMR 2214 CNRS, Laboratoire de Genie des Procedes Catalytiques, Villeurbanne F-69616, Fr.). Inorganica Chimica Acta, 350, 407-413 (English) 2003 Elsevier Science B.V. CODEN: ICHAA3. ISSN: 0020-1693. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 22 The methylchlorodisilanes MeCl2Si-SiCl2Me, MeCl2Si-SiClMe2 and MeCl2Si-SiMe3 disproportionate in the presence of nucleophilic catalysts into the methylchlorosilanes MeSiCl3, Me2SiCl2, Me3SiCl and the polysilanes SinMenCln+2, SinMen+1Cln+1 and SinMen+2Cln (n = 3-5). Qual. kinetic studies of the disproportionation reveal that the catalytic activities of the nucleophiles are ranked according to: phosphine oxides (OPnBu3, OP(NMe2)3) > chlorides (nBu4NCl, nBu4PCl) > phosphines (PnBu3, PiPr3, PMe2Ph, P(NMe2)3, PCy3, PPh3) > phosphites (P(OPh)3). For the PR3 compds., a correlation is obsd. between the p acceptor character the activity for the disproportionation, the lower p acceptor the nucleophile, the higher the rate. A two step mechanism is proposed which involves the formation of an intermediate followed by condensation with the substrate disilane to afford the polysilanes. Investigation of the reaction of the intermediate with hydrogen as a test reaction provides evidences for the condensation step to be rate limiting in the disproportionation. That result, combined with the fact that poor p acceptor nucleophiles (phosphine oxides, chlorides and trialkylphosphines) are more active disproportionation catalysts, supports the description of the intermediate as a stabilized silylene. .

Palladium-catalyzed reaction of butadiene and carbon dioxide

Palladium-catalyzed reaction of butadiene and carbon dioxide. Behr, Arno; Juszak, Klaus D. (Inst. Tech. Chem. Petrolchem., Rheinisch-Westfael. Tech.There are some reagents with their cas registry numbers 106-99-0 and 6476-36-4 are used in this study. Hochsch., Aachen D-5100, Fed. Rep. Ger.). J. Organomet. Chem., 255(2), 263-8 (English) 1983. CODEN: JORCAI. ISSN: 0022-328X. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The selective syntheses of the d-lactone 2-ethylidene-6-hepten-5-olide and of the g-lactone 2-ethyl-2,4-heptadien-4-olide by the Pd-catalyzed reaction of CO2 and butadiene are described. Mechanistic studies showed that the formation of the g-lactone proceeds by a consecutive reaction via the d-lactone. The products are accounted for in terms of a reaction path involving an allylic Pd carboxylate complex as a key intermediate. .