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- W2000600100 abstract "The pentafluorophenoxy ligand was introduced into the new cyclic pentaoxyphosphoranes S[(t-Bu)MeC6H2O]2P(OC6F5)(O2C6Cl4) (1), S[(t-Bu)MeC6H2O]2P(OC6F5)(O2C14H8) (2), and S[(t-Bu)MeC6H2O]2P(OC6F5)3 (3). X-ray analysis revealed hexacoordinate structures formed by sulfur donor action present as a bridging atom in flexible eight-membered rings for 1−3. X-ray analysis showed that sulfur coordination also occurred with the same type of ring system as part of the phosphite S[(t-Bu)MeC6H2O]2P(OC6F5) (4) to give a pseudo-trigonal-bipyramidal geometry. The pentafluorophenoxy ligand present in the oxyphosphoranes 1−3 as well as in the phosphite 4 acts comparably to a chlorine atom in its ability to enhance phosphorus electrophilicity as measured by the degree of P−S coordination and geometrical displacement toward a more highly coordinated state. The phosphite 4 has a P−S donor distance of 2.876(2) Å, considerably longer than the range of P−S distances from 2.366(3) to 2.495(2) Å obtained for the pentaoxyphosphoranes 1−3. These data express quantitatively the relative electrophilicity of phosphorus as a function of coordination number and substituent composition." @default.
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- W2000600100 date "1998-07-01" @default.
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- W2000600100 title "Increased Coordination via Sulfur Donor Action in Cyclic Pentaoxyphosphoranes and the Parent Cyclic Phosphite. Influence of Pentafluorophenoxy Ligands<sup>1</sup>" @default.
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- W2000600100 doi "https://doi.org/10.1021/ic971593q" @default.
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