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Metal-template-directed synthesis of diphosphorus compounds through intramolecular phosphinidene additions

机译:金属模板定向合成通过分子内次亚膦酸酯加成的二磷化合物

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Heating the nonchelating cis-bis-7-phosphanorbornadiene-[Mo(CO)(4)] complex (13) results in the thermal decomposition of one of the 7-phosphanorbornadiene groups. The phosphinidene thus generated adds intramolecularly to a C C bond of the other ligand to give the novel diphosphorus complex 14. This reaction constitutes a metal-template-directed synthesis. Likewise, the intramolecular phosphinidene addition to the C=C bond of a Mo-phospholene ligand affords the diphos complex 18. Its crystal structure exhibits an extremely small P-Mo-P bite-angle for a five-membered chelate ring. The similar intramolecular 1,2-addition to a C=C bond of a phosphole ligand gives a highly strained, unstable intermediate product. Scission of its P-Mo bond generates a free coordination site, which is then occupied by either CO or a phosphole to yield complexes 22 and 23, respectively. The analogous intermolecular addition of [PhPW(CO)(5)] to a [phosphole-W(CO)(5)] complex gives the di-[W(CO)(5)] complexed adduct 28. The directing effect of the metal on the intra- and intermolecular additions is discussed. [References: 35]
机译:加热非螯合的顺式-双-7-膦基降冰片二烯-[Mo(CO)(4)]络合物(13)导致7-磷基降冰片二烯基团之一的热分解。如此生成的次亚膦酸酯分子内加至另一个配体的C C键上,得到新颖的二磷配合物14。该反应构成了金属模板导向的合成。同样地,分子内次膦基加到Mo-膦烯配体的C = C键上得到了双磷配合物18。它的晶体结构对五元螯合环显示出非常小的P-Mo-P咬合角。将类似的分子内1,2-加成到磷脂配体的C = C键上得到高度应变的,不稳定的中间产物。切断其P-Mo键会产生一个自由配位位点,然后被CO或磷脂占据,分别生成络合物22和23。将[PhPW(CO)(5)]分子间加成到[磷脂-W(CO)(5)]络合物中,得到二-[W(CO)(5)]络合物加合物28。讨论了金属在分子内和分子间的加成。 [参考:35]

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