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Zusammenfassung O-Alkylierung von Triphenylphosphinoxid, Benzolphosphonsäurediäthylester oder Diphenylphosphinsäureäthylester mit Triäthoxoniumtetrafluoborat führt zu Salzen, die sich mit Hilfe von Magnesium in Methanol zu Triphenylphosphin, Benzolphosphonigsäureester bzw. Diphenylphosphinigsäureester reduzieren lassen.  相似文献   

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Carbophilic reaction of 1,3-benzodithiole-2-thione (1) with trideuteroborane · dimethylsulfide, synthesized from NaBD4 and BF3 ·Me 2S inTHF, gave 2,2-dideutero-1,3-benzodithiole (5 b) as well as the minor side-products7 b,8 and9 b.
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Selenite reacts with S2O 3 2− forming SeS4O 6 2− and S4O 6 2− . When the stoichiometric ratio (1∶4) is changed, secondary reactions take place and precipitation, of selenium is observed. Excessive S2O 3 2− reacts with SeS4O 6 2− in neutral solutions forming SeSSO 3 2− , which decomposes to Se. In acidic solutions this reaction has a minor importance and causes a small Se-precipitation. The main product gives a build-up reaction, forming SeS5O 6 2− . Excessive SeO 3 2− also gives SeSSO 3 2− and SeS5O 6 2− . SeSSO 3 2− is decomposed by sulfite, forming SeSO 3 2− and S2O 3 2− . Thiosulfate reduces SeO 3 2− to SeS4O 6 2− . SeSO 3 2− gives, a build-up reaction with SeS5O 6 2− , forming Se2S5O 6 2− and Se3S5O 6 2− . Decomposition of Se3S5O 6 2− causes precipitation of a S/Se-mixture. SeSSO 3 2− , SeS5O 6 2− , Se2S5O 6 2− and Se3S5O 6 2− have been detected for the first time.   相似文献   

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