the lability of Pv-Teri compounds (tellurium atom transfer between phosphanes)"]. Thus, we have recently shown that tellurium can be inserted into the P-Si bond of di-tertbutyl(trimethylsily1)phosphane la, but is incapable of inducing a further oxidation of the tellurophosphinite 2a['"'. The insertion product merely equilibrates with the symmetrically substituted tellurium compounds 3 and 4. We have now found that when a less bulky silylphosphane is used as starting material, a novel P-P coupling by detelluration (3 -f 5) follows the reaction steps 1 + 2 and 2 -, 3 + 4 : diphenyl(trimethylsily1)phosphane l b reacts smoothly with tellurium to give tetraphenyldiphosphane 5b and bis(trimethylsilyl) telluride 4. + 2 Te 3 li2PSiAle3 -d 2 RzP-le-SiR.le3 l a , It = t H u l b . K = P h 2 \ 11 z P -1~~ -PK2 + hIe3Si-'I'e-Si >,I e3 [Z 456 IE] German version: Angew. Chem. 95 (1983) 1003Angew. Chem. Znr. Ed. Engl. 22 (1983) No. I 2 0 Verlug Chemie GmbH.
spektroskopischen Daten fur die freie und die komplexgebundene Keteneinheit unterscheiden sich nur geringfugig (Tabelle 1). Die erwartete Hochfeldverschiebung aller NMR-Signale von 3 im Vergleich zu 1 wirkt sich naturge-miD bei der A~(CH~)~-Gruppe am stirksten aus. Tabelle 1. 1R-, 'H-NMR-und '3C-NMR-spektroskopische Daten von 1 und 3.
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