Synthesis and Characterization of Some Rhenium Complexes with the New Mixed Phosphorus-Nitrogen Donor Ligand NPh(CH2CH2PPh2)2

DOI: 10.1039/DT9920001735

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1735 - 1738 (1992)

Update date:2022-08-03

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Authors:

Michos, Demetrius

Luo, Xiao-Liang

Crabtree, Robert H.

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Article abstract of DOI:10.1039/DT9920001735

Reaction of NPh(CH2CH2Cl)2 with LiPPh2 at 0 deg C yields the new mixed nitrogen-phosphorus donor ligand NPh(CH2CH2PPh2)2 (L).Reaction of with L in CH2Cl2 at room temperature gives 3.Reaction of with L in refluxing benzene gives 4.Treatment of 3 or 4 with LiAlH4 at 0 deg C in Et2O affords 5.Protonation of 5 with HBF4*OEt2 in CD2Cl2 at 193 K gives ⁺ 6.Deprotonation of 6 with NEt3 regenerates 5 quantitatively.Compound 5 shows a 1H NMR T₁ (minimum) value of 78 ms at 250 MHz, consistent with a classical structure having only terminal hydride ligands, while 6 shows a T₁ (minimum) value of 10 ms, suggesting a non-classical structure containing one or more η²- H2 ligands.

Full text of DOI:10.1039/DT9920001735

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