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
C. Hänisch
中科院分区:
化学3区
文献类型:
--
作者:
Andreas Kracke;C. Hänisch

文献摘要

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通过伯或环状二膦基硅氧烷化合物的金属化和随后使用C2 H4 Br 2作为试剂的氧化偶联,可以实现双烷桥连的P2和P4化合物的合成。从环状二膦基硅氧烷[O(iPr 2Si)2 PH]2开始,与碱土金属的硅氮烷化物反应,得到金属化化合物[M(DME)2{O(iPr 2Si)2 P}2](1:M = Ca,2:M = Sr,3:M = Ba)。随后的氧化产生双环物质P2[O(iPr 2Si)2]2(4)。在与伯二膦基硅氧烷O(iPr 2Si)2 PH 2类似的反应顺序中,可以获得环状二膦O(iPr 2SiPH)2(5),并成功地用于相同的反应途径,得到相应的金属化化合物6。进一步的氧化偶联导致分子间P-P键的形成,产生笼状化合物P4[O(iPr 2Si)2]2(7)。
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).