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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis of Li/OR phosphinidenoid complexes: on the evidence for intramolecular O-Li donation and the effect of cation encapsulation
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Synthesis of Li/OR phosphinidenoid complexes: on the evidence for intramolecular O-Li donation and the effect of cation encapsulation

机译:Li / OR膦基类固醇配合物的合成:关于分子内O-Li捐赠的证据以及阳离子包封的影响

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摘要

Synthesis of phosphinite complexes 12-14a-c, 15a and 16a was achieved via reaction of transient Li/Cl phosphinidenoid complexes 6-10, prepared from dichloro(organo)phosphane complexes [(OC)_5M- {RPCl_2}] 1-5 (1,6: R = CPh_3, 2,7: R = C_5Me_5, 3-5, 8-10: R = CH(SiMe_3)_2, 1-3, 6-8: M = W, 9: M = Mo, 10: M = Cr), with different alcohols 11a-c (a: R = allyl, b: R = methyl, c: R = isopropyl). Deprotonation of complexes 12b, 13b with MeLi or tBuLi in the presence of two equivalents of 12-crown-4 led to the selective formation of phosphinidenoid complexes [Li(12-crown-4)_2] [(OC)_5W{RP(OCH_3)}] (18a R = CPh_3 and 18b R = C_5Me_5) which were stable in solution at ambient temperature, in contrast to Li/OMe phosphinidenoid complexes without 12-crown-4. To our surprise attempts to crystallise complex 18b yielded complex 21 having a Li-O-P subunit. The reaction of complex 17c with [Ph_3C]BF_4 yielded the P-C coupling product 26 and, hence, the first evidence for an oxidative SET reaction. All isolated products were characterised by multinuclear NMR spectroscopy, IR, MS and single-crystal X-ray crystallography in the case of complexes 12a,b, 13b, 14a-c, 15a, 16a and 21.
机译:通过由二氯(有机)膦配合物[(OC)_5M- {RPCl_2}] 1-5制备的瞬态Li / Cl膦亚基化合物6-10的反应,可实现次膦酸酯配合物12-14a-c,15a和16a的合成。 1,6:R = CPh_3,2,7:R = C_5Me_5,3-5,8-10:R = CH(SiMe_3)_2,1-3,6-8:M = W,9:M = Mo, 10:M = Cr),具有不同的醇11a-c(a:R =烯丙基,b:R =甲基,c:R =异丙基)。在存在两个当量的12-crown-4的情况下,用MeLi或tBuLi对复合物12b,13b进行质子化导致选择性形成膦类化合物[Li(12-crown-4)_2] [(OC)_5W {RP(OCH_3 )}](18a R = CPh_3和18b R = C_5Me_5)在室温下在溶液中稳定,与没有12-crown-4的Li / OMe膦亚基络合物形成对比。令我们惊讶的是,使配合物18b结晶的尝试产生了具有Li-O-P亚基的配合物21。配合物17c与[Ph_3C] BF_4的反应产生了P-C偶联产物26,因此,是氧化SET反应的第一个证据。在配合物12a,b,13b,14a-c,15a,16a和21的情况下,所有分离出的产物均通过多核NMR光谱,IR,MS和单晶X射线晶体学进行表征。

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