Stepwise Synthesis of Siloxane-Substituted Oligophosphanes Pn[O(iPr2Si)2]2 (n = 2, 4)
Stepwise Synthesis of Siloxane-Substituted Oligophosphanes Pn[O(iPr2Si)2]2 (n = 2, 4)
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硅氧烷取代的低聚膦 Pn[O(iPr2Si)2]2 (n = 2, 4) 的逐步合成
DOI:
10.1002/ejic.201100375
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发表时间:
2011
影响因子:
2.3
通讯作者:
C. Hänisch
中科院分区:
文献类型:
--
作者:
Andreas Kracke;C. Hänisch
The synthesis of siloxane-bridged P2 and P4 compounds can be achieved through metalation of primary or cyclic diphosphanylsiloxane compounds and subsequent oxidative coupling using C2H4Br2 as reagent. Starting from the cyclic diphosphanylsiloxane [O(iPr2Si)2PH]2, the reaction with the silazanides of the earth alkaline metals leads to the metalated compounds [M(DME)2{O(iPr2Si)2P}2] (1: M = Ca, 2: M = Sr, 3: M = Ba). Subsequent oxidation yields the bicyclic species P2[O(iPr2Si)2]2 (4). In an analogous reaction sequence with the primary diphosphanylsiloxane O(iPr2Si)2PH2 the cyclic diphosphane O(iPr2SiPH)2 (5) could be obtained and was successfully used for the same reaction pathway, leading to the corresponding metalated compound 6. Further oxidative coupling resulted in an intermolecular P–P bond formation, yielding the cage compound P4[O(iPr2Si)2]2 (7).