Photochemical Reactions of Fluorinated Pyridines at Half-Sandwich Rhodium Complexes: Competing Pathways of Reaction.

Photochemical Reactions of Fluorinated Pyridines at Half-Sandwich Rhodium Complexes: Competing Pathways of Reaction.
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DOI:
10.1021/om400552r
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发表时间:
2014-01-13
期刊:
影响因子:
2.8
通讯作者:
Whitwood AC
Whitwood AC
中科院分区:
化学2区
文献类型:
--
作者:
Procacci B;Blagg RJ;Perutz RN;Rendón N;Whitwood AC

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CpRh(PMe_3)(C_2 H_4)(1; Cp = η_5-C_5 H_5)在五氟吡啶存在下的己烷溶液中低温辐照得到可分离的η_2-C,C-配位五氟吡啶配合物CpRh(PMe_3)(η_2-C,C-C_5 NF_4)(2)。2的分子结构通过单晶X-射线衍射测定,显示C3-C4配位,不像以前的五氟吡啶络合物结构显示N-配位。用2,3,5,6-四氟吡啶进行的相应实验产生C-H氧化加成产物CpRh(PMe 3)(C5 NF 4)H(3)。相反,在4-取代的四氟吡啶C5 NF 4X(其中X = NMe 2,OMe)存在下,1在己烷中的UV照射导致C2 H4和HF消除,分别形成金属杂环CpRh(PMe 3)(κ2-C,C-CH 2N(CH 3)C5 NF 3)(4)和CpRh(PMe 3)(κ2-C,C-CH 2 OC 5 NF 3)(5)。化合物4的X-射线衍射结构表明是一个平面的RhCCNC-五元环。配合物2-5也可以通过CpRh(PMe 3)(Ph)H与相应吡啶在50 °C下的热反应形成。
Irradiation of CpRh(PMe3)(C2H4) (1; Cp = η5-C5H5) in the presence of pentafluoropyridine in hexane solution at low temperature yields an isolable η2-C,C-coordinated pentafluoropyridine complex, CpRh(PMe3)(η2-C,C-C5NF4) (2). The molecular structure of 2 was determined by single-crystal X-ray diffraction, showing coordination by C3–C4, unlike previous structures of pentafluoropyridine complexes that show N-coordination. Corresponding experiments with 2,3,5,6-tetrafluoropyridine yield the C–H oxidative addition product CpRh(PMe3)(C5NF4)H (3). In contrast, UV irradiation of 1 in hexane, in the presence of 4-substituted tetrafluoropyridines C5NF4X, where X = NMe2, OMe, results in elimination of C2H4 and HF to form the metallacycles CpRh(PMe3)(κ2-C,C-CH2N(CH3)C5NF3) (4) and CpRh(PMe3)(κ2-C,C-CH2OC5NF3) (5), respectively. The X-ray structure of 4 shows a planar RhCCNC-five-membered ring. Complexes 2–5 may also be formed by thermal reaction of CpRh(PMe3)(Ph)H with the respective pyridines at 50 °C.
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