Synthesis, structure and reactivity of fluorovinyl nickel complexes: formation of a phosphonioethenyl complex
作者： Thomas Braun , Berit Blöcker , Verena Schorlemer , Beate Neumann , Anja Stammler
DOI: 10.1039/B200739H
关键词:
摘要: Treatment of [Ni(COD)2] with trifluoroiodoethene or 1,1-dibromodifluoroethene in the presence PEt3 effects formation complexes trans-[NiI(CFCF2)(PEt3)2] (1) and trans-[NiBr(CBrCF2)(PEt3)2] (2), respectively. Reaction 1 NaBAr′4 acetonitrile gives trans-[Ni(CFCF2)(NCMe)(PEt3)2]BAr′4 (4) [Ar′ = 3,5-C6H3(CF3)2]. CO yields cationic complex trans-[Ni(CFCF2)(CO)(PEt3)2]BAr′4 (5), which is only stable a CH2Cl2 solution. The reaction tBuNC affords compound trans-[Ni(CFCF2)(CNtBu)(PEt3)2]BAr′4 (6). On treatment 6 can be converted into dicationic phosphonioethenyl trans-[Ni{CFCF(PEt3)}(CNtBu)(PEt3)2][BAr′4]2 (7). structures 2 7 have been determined by X-ray crystallography. ligand bound at nickel Ni–C distance 1.893(5) A. CC CF–P bond lengths are 1.309(6) A 1.794(5) A,
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