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Tuning the Nature and Formation of Bis(dihydrogen)–Osmium Species

机译:调整双(二氢)物种的性质和形成

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摘要

The influence of chelate ligands in the formation and nature of bis(dihydrogen) units of OsH_(4) complexes has been studied. The classical trihydride OsH_(3){κ~(2)- C , N -(C_(6)H_(4)-py)}(P~(i)Pr_(3))_(2) ( 1 ) reacts with HBF_(4)·OEt_(2) to give the Kubas-type dihydrogen–elongated dihydrogen derivative [Os{κ~(2)- C , N -(C_(6)H_(4)-py)}(η~(2)-H_(2))_(2)(P~(i)Pr_(3))_(2)]BF_(4) ( 2 ), as a result of the protonation of one of the hydride ligands. Triflate (OTf) displaces the Kubas-type dihydrogen and elongates the elongated dihydrogen ligand, which is converted into a compressed dihydride. Thus, the addition of 1 equiv of HOTf to 1 leads to Os(H···H){κ~(2)- C , N -(C_(6)H_(4)-py)}(OTf)(P~(i)Pr_(3))_(2) ( 3 ). Similar to [OTf]~(?), acetone reacts with 2 to afford the related compressed dihydride [Os(H···H){κ~(2)- C , N -(C_(6)H_(4)-py)}(κ~(1)-OCMe_(2))(P~(i)Pr_(3))_(2)]BF_(4) ( 4 ), whereas acetonitrile leads to a 1:8 mixture of the monohydride [OsH(CH_(3)CN)_(3)(P~(i)Pr_(3))_(2)]BF_(4) ( 5 ) and the trihydride [OsH_(3)(CH_(3)CN)_(2)(P~(i)Pr_(3))_(2)]BF_(4) ( 6 ). Reactions of 2 with toluene and p -xylene yield the half-sandwich derivatives [Os{κ~(2)- C , N -(C_(6)H_(4)-py)}(η~(6)-toluene)(P~(i)Pr_(3))]BF_(4) ( 7 ) and [Os{κ~(2)- C , N -(C_(6)H_(4)-py)}(η~(6)- p -xylene)(P~(i)Pr_(3))]BF_(4) ( 8 ), respectively. The acyl oxygen atom of the C , C -chelate ligand of the trihydride OsH_(3){κ~(2)- C , C -[C(O)CH_(2)ImMe]}(P~(i)Pr_(3))_(2) ( 10 ; Im = imidazolylidene) provides reliable and effective protection of the hydride ligands against the protonation. Thus, the addition of HBF_(4)·OEt_(2) or HOTf to 10 leads to the trihydride-hydroxycarbene cation [OsH_(3){κ~(2)- C , C -[C(OH)CH_(2)ImMe]}(P~(i)Pr_(3))_(2)]~(+) ( 11 ). The hydroxycarbene–NHC ligand of the latter is unstable, undergoing an intramolecular 1,3-hydrogen shift, which produces the rupture of the chelate ligand and the formation of the cis -hydride dihydrogen ( 12a ) and trans -hydride?
机译:研究了螯合配体在摩擦(4)络合物的BIS(二氢)单位的形成和性质中的影响。典型的Trihydride OSH_(3){κ〜(2) - C,N - (C_(6)H_(4)-py)}(p〜(i)pr_(3))_(2)(1)反应与HBF_(4)·OEt_(2),得到Kubas型二氢伸长二氢衍生物[锇{κ〜(2) - C,N - (C_(6)H_(4)-py)}(η〜 (2)-H_(2))_(2)(P〜(I)PR_(3))_(2))_(2)] BF_(4)(2),由于其中一种氢化物配体的质子化。 Triflate(OTF)取代库拜型二氢,并伸长细长的二氢配体,其转化成压缩的二氢盐。因此,将1当量的HotF加入1导致OS(H .....){κ〜(2) - C,N - (C_(6)H_(4)-py)}(otf)(p 〜(i)PR_(3))_(2)(3)。类似于〜(?),丙酮与2反应2,得到相关压缩的二氢丙基[OS(H···H){κ〜(2) - C,N - (C_(6)H_(4) - py)}(κ〜(1)-ocme_(2))(p〜(i)pr_(3))_(2)] bf_(4)(4),而乙腈导致1:8的混合物单氢化物[orosh(Ch_(3)CN)_(3)(p〜(i)pr_(3))_(2)] bf_(4)(5)和三水合[ost_(3)(ch_(3) CN)_(2)(P〜(I)PR_(3))_(2)] BF_(4)(6)。 2用甲苯和丙烯的反应产生半夹心衍生物[os {κ〜(2) - c,n - (c_(6)h_(4)-py)}(η〜(6) - 托uene) (p〜(i)pr_(3))] Bf_(4)(7)和[os {κ〜(2) - c,n - (c_(6)h_(4)-py)}(η〜( 6) - 乙烯)(P〜(I)PR_(3))]分别为BF_(4)(8)。三水合摩擦ω的C,C - 螯合配体的酰基氧原子ω(3){κ〜(2) - C,C - [C(O)CH_(2)Imme]}(P〜(i)PR_( 3))_(2)(10; Im =咪唑基)提供对质子化氢化物配体的可靠和有效保护。因此,加入HBF_(4)·OET_(2)或HotF至10导致TrihyDride-羟基氨基阳离子[ω-κ〜(2) - C,C - [C(OH)CH_(2) Imme]}(p〜(i)pr_(3))_(2)]〜(+)(11)。后者的羟基甲苯-NHC配体是不稳定的,经历分子内1,3-氢转移,这产生了螯合配体的破裂和CIS-rydrive二氢(12a)和反式氢化物的形成?

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  • 来源
    《Organometallics》 |2018年第3期|共13页
  • 作者单位

    Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) Centro de Innovación en Química Avanzada (ORFEO?CINQA) Universidad de Zaragoza CSIC 50009 Zaragoza Spain;

    Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) Centro de Innovación en Química Avanzada (ORFEO?CINQA) Universidad de Zaragoza CSIC 50009 Zaragoza Spain;

    Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) Centro de Innovación en Química Avanzada (ORFEO?CINQA) Universidad de Zaragoza CSIC 50009 Zaragoza Spain;

    Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) Centro de Innovación en Química Avanzada (ORFEO?CINQA) Universidad de Zaragoza CSIC 50009 Zaragoza Spain;

    Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) Centro de Innovación en Química Avanzada (ORFEO?CINQA) Universidad de Zaragoza CSIC 50009 Zaragoza Spain;

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  • 中图分类 元素有机化合物;
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