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- W2052565673 abstract "The syntheses and structures of two new compounds are reported. The first compound, [Cr(CO)4]2[C4F2(PPh2)4], obtained from Cr(CO)4(PPh2H)2 and CF3CCF3 in the presence of one equivalent of BuLi has a structure with the ligand 1,2,3,4-tetrakis(diphenylphosphino)-1,4-difluorobutadiene chelating to two Cr(CO)4 groups via the 1,4 and 2,3 phosphine groups. A mechanism for the formation of this compound is suggested which involves sequential deprotonation of a phosphine, nucleophilic attack on the fluorocarbon, and fluoride ion elimination. The second compound, CrC36H28P2O7, arises from a similar base promoted reaction of Cr(CO)4-(PPhH2)2 and PhCCCOOEt. Here the expected initial product from cyclization of these reactants acts as a nucleophile to attack a second equivalent of the acetylene. The intermediate carbanion from this reaction can undergo a ring closure by displacement of OEt-, giving the observed product." @default.
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- W2052565673 date "1978-10-01" @default.
- W2052565673 modified "2023-09-25" @default.
- W2052565673 title "Molecular structures of two unexpected metal complexes obtained from additions of coordinated phosphines to acetylenes" @default.
- W2052565673 doi "https://doi.org/10.1016/s0022-328x(00)92233-2" @default.
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