Polycondensation and disproportionation of an oligosiloxanol in the presence of a superbase
作者: Agnieszka GrzelkaJulian ChojnowskiMarek CyprykWitold FortuniakPeter C. HupfieldRichard G. Taylor
作者单位: 1Centre of Molecular and Macromolecular Studies, Sienkiewicza 112, 90-363 Łódz, Poland
2Dow Corning Ltd., Cardiff Road, South Glamorgan, Wales CF63 2YL, UK
刊名: Journal of Organometallic Chemistry, 2002, Vol.660 (1), pp.14-26
来源数据库: Elsevier Journal
DOI: 10.1016/S0022-328X(02)01650-9
关键词: SilanolsPolysiloxanesSilanol polycondensationSiloxanol disproportionation
原始语种摘要: Abstract(#br)Kinetics of reactions of model oligosiloxanols, 1,1,3,3,3-pentamethyldisiloxane-1-ol (MDH) and 1,1,3,3,5,5,5-heptamethyltrisiloxane-1-ol (MD 2 H), which occur in the presence of phosphazenium superbase, hexapyrrolidine-diphosphazenium hydroxide, in an acid–base inert solvent, toluene, was studied using sampling and gas chromatographic analysis method. In addition, kinetics of reactions of MDH and MD 2 H with trimethylsilanol (MH) was studied. In the MDH and MD 2 H systems the oligosiloxanol condensation competes with the oligosiloxanol disproportionation, the latter being the dominating process. The disproportionation products, i.e. MD n +1 H and MD n −1 H, n =1, 2, … undergo analogous consecutive disproportionation and condensation reactions. The kinetic law was derived and...
全文获取路径: Elsevier  (合作)
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影响因子:2 (2012)

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关键词翻译
关键词翻译
  • substituent 取代基
  • condensation 冷凝
  • nucleophilic 亲核的
  • siloxane 硅氧烷
  • geminal 成对的
  • hydroxyl 羟基
  • conform 使一致
  • bimolecular 两分子的
  • bonds 公债
  • catalyst 催化剂