The reaction of the singlet biradical [P(μ-NHyp)]2 (Hyp = hypersilyl, (Me3Si)3Si) with different isonitriles afforded a series of five-membered N2P2C heterocycles. Depending on the steric bulk of the substituent at the isonitrile, migration of a Hyp group was observed, resulting in two structurally similar but electronically very different isomers. As evidenced by comprehensive spectroscopic and theoretical
单重双自由基[P(μ-NHyp)] 2(Hyp =高甲硅烷基,(Me 3 Si)3 Si)与不同的异腈反应,得到一系列五元N 2 P 2C杂环。取决于取代基在异腈上的空间体积,观察到Hyp基团的迁移,产生两种结构相似但电子上非常不同的异构体。全面的光谱学和理论研究证明,杂环戊二烯异构体可被认为是一种反应性不强的具有一个局部N═P和一个C═P双键的闭壳单线态物种,而杂环戊二二烯异构体则代表一个开环的单线态双自由基。有趣的光化学性质,例如在红光照射下光异构化为[2.1.0]-烷型物质。
[P(μ-NTer)]2: A Biradicaloid That Is Stable at High Temperature
Radical protection makes a biradical: High‐temperature‐stablebiradicaloids [P(μ‐NR)]2 (R=Ter, Hyp) were isolated from [ClP(μ‐NR)]2 when mild reducing agents were employed. The bulky substituents prevent dimerization. Ter=2,6‐Mes2C6H3, with Mes=2,4,6‐Me3C6H2; Hyp=(Me3Si)3Si.
自由基保护形成双自由基:使用轻度还原剂时,高温稳定双自由基[P(μ-NR)] 2(R = Ter,Hyp)从[ClP(μ-NR)] 2分离出来。庞大的取代基防止二聚。Ter = 2,6‐Mes 2 C 6 H 3,其中Mes = 2,4,6‐Me 3 C 6 H 2;Hyp =(Me 3 Si)3 Si。
Silver tetrakis(hexafluoroisopropoxy)aluminate as hexafluoroisopropyl transfer reagent for the chlorine/hexafluoroisopropyl exchange in imino phosphanes
Treating 1,3-dichloro-2,4-bis[tris(trimethylsilyl)silyl]-cyclo-diphosphadiazane, [HypNPCl](2) ((Me(3)Si)(3)Si = Hyp), or N-(2,4,6-tri-tert-butylphenyl)imino(chloro)phosphane, Mes*-N=P-Cl (Mes* = 2,4,6-tri-tert-butylphenyl), with Ag[Al(OCH(CF(3))(2))(4)] leads to the abstraction of [OCH(CF(3))(2)] from the counter ion [Al(OCH(CF(3))(2))(4)] in a formal Lewis acid/Lewis base reaction. The final products Hyp(2)N(2)P(2)(Cl)-(OCH(CF(3))(2)), Mes*-N=P-OCH(CF(3))(2) and the dimeric Lewis acid [Al(OCH(CF(3))(2))(3)](2) have been characterized by means of X-ray analysis. (C) 2009 Elsevier B. V. All rights reserved.