- BEITRAEGE ZUR CHEMIE DES PHOSPHORS 90. 1,2,3-TRIPHENYLTRIPHOSPHAN
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The title compound 1 is formed as the main product of alcoholysis of 1,2,3-triphenyl-1,3-bis(trimethylsilyl)-triphosphane, (Me3Si)2(PPh)3.The triphosphane is relatively stable in solution below -30 grad C.At room temperature, 1 disproportionates yielding PhPH2, H2(PPh)2 and (PPh)5.These rearrangements take place via a four-membered transition state preferentially involving P-P bonds.In solution 1 forms the three diastereomers 1a(threo/threo), 1b(threo/erythro), and 1c(erythro/erythro) in a ratio of about 3:4:1.Their correlation to the 31P NMR spectroscopically observed spin systems results from the dependence of the 1JP-P-coupling constants on dihedral angles and from the ratio of the isomers immediately after the stereospecific solvolysis.
- Baudler, M.,Reuschenbach, G.
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