Examples of Different Reactions of Benzylsulfanyl‐Substituted Alkynes with Selected Complexes of TiII and CoI

Examples of Different Reactions of Benzylsulfanyl‐Substituted Alkynes with Selected Complexes of TiII and CoI
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苄基硫基取代的炔烃与选定的 TiII 和 CoI 配合物的不同反应示例

DOI:
10.1002/ejic.201300312
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发表时间:
2013
影响因子:
2.3
通讯作者:
Uwe Rosenthal
Uwe Rosenthal
中科院分区:
化学3区
文献类型:
--
作者:
Kai Altenburger;Julia Semmler;Perdita Arndt;Anke Spannenberg;Matthias J. Meel;Alexander Villinger;Wolfram W. Seidel;Uwe Rosenthal

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第4族金属茂炔络合物[Cp 2 M(L)(btmsa)]的反应(Cp = η5-CN = η5-C5H5,btmsa = η2-Me3SiC2SiMe3;1:M = Ti,L =无;2:M = Zr,L =吡啶)和[(triphos)CoI]部分[triphos = 1,1,研究了1-三(二苯基膦基甲基)乙烷]与苄硫基取代乙炔PhCH_2S-C_2-SCH_2Ph(3)和PhCH_2S-C_2-SFmoc(4)(Fmoc =芴甲氧羰基)的反应。配合物1与3反应得到紫色固体[Cp 2 Ti(SCH 2 Ph)2](5)。随后,该紫色固体在甲苯中于70 °C转化为双核配合物[(Cp 2 Ti)2(μ-κ2-κ2-BnSC 4SBn)](6),其显示两个由1,4-双(苄硫基)-1,3-丁二炔以反式构型桥接的[Cp 2 Ti]部分。配合物6在100 °C甲苯中进一步降解为四核簇合物[CpTiS]4(7)。间接推断出反应伙伴1/4和2/3的反应活性相似。对于CoI,得到侧链炔配合物[(triphos)Co(3)](PF 6)(9-PF 6)和[(triphos)Co(4)](PF 6)(10-PF 6)。还原除去9-PF 6中的苄基和随后的[Cp(PPh 3)RuII]+部分的配位导致双核配合物[(triphos)Co(μ-η2-κ2-C2 S2)RuCp(PPh 3)](13)以侧碳-硫螯合物配位模式显示乙炔二硫纶(acdt 2-)。相比之下,10-PF 6与哌啶在非常温和的条件下的反应导致硫代炔络合物[(triphos)Co(PhCH 2SC 2S)](11)在配位炔上带有末端硫取代基。然而,随后的重排反应导致CoIII二硫烯络合物[(triphos)Co{S2 C2(NC 5 H10)(CH 2 Ph)}](PF 6)(14-PF 6)。复杂的重排很可能涉及双核Co物种与C2 S2部分的η2-κ 2配位。
Reactions of the group 4 metallocene alkyne complexes [Cp2M(L)(btmsa)] (Cp = η5‐cyclopentadienyl = η5‐C5H5, btmsa = η2‐Me3SiC2SiMe3;1: M = Ti, L = none;2: M = Zr, L = pyridine) and of the [(triphos)CoI] moiety [triphos = 1,1,1‐tris(diphenylphosphanylmethyl)ethane] with the benzylsulfanyl‐substituted acetylenes PhCH2S–C2–SCH2Ph (3) and PhCH2S–C2–SFmoc (4) (Fmoc = fluorenylmethoxycarbonyl) have been investigated. Complex1reacted with3to give a mixture of a violet solid and [Cp2Ti(SCH2Ph)2] (5). Subsequently, the violet solid transformed in toluene at 70 °C into the dinuclear complex [(Cp2Ti)2(μ‐κ2‐κ2‐BnSC4SBn)] (6) displaying two [Cp2Ti] moieties bridged by a 1,4‐bis(benzylsulfanyl)‐1,3‐butadiyne in thetransconfiguration. Complex6was further degraded in toluene at 100 °C to the tetranuclear cluster [CpTiS]4(7). Similar reactivity was deduced indirectly for the reaction partners1/4and2/3. For CoI, the side‐on alkyne complexes [(triphos)Co(3)](PF6) (9‐PF6) and [(triphos)Co(4)](PF6) (10‐PF6) were obtained. Reductive removal of the benzyl groups in9‐PF6and subsequent coordination of the [Cp(PPh3)RuII]+moiety led to the dinuclear complex [(triphos)Co(μ‐η2‐κ2‐C2S2)RuCp(PPh3)] (13) displaying acetylene dithiolate (acdt2–) in a side‐on carbon–sulfur chelate coordination mode. In contrast, the reaction of10‐PF6with piperidine under very mild conditions resulted in the thio‐alkyne complex [(triphos)Co(PhCH2SC2S)] (11) bearing a terminal sulfur substituent at the coordinated alkyne. However, a subsequent rearrangement reaction led to the CoIIIdithiolene complex [(triphos)Co{S2C2(NC5H10)(CH2Ph)}](PF6) (14‐PF6). The intricate rearrangement very likely involves a dinuclear Co species with a η2‐κ2coordination of the C2S2moiety.
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