Primäre Phosphane reagieren mit S8 oder Se8 und bilden neben einer großen Anzahl von Nebenprodukten Organylphosphanmonosulfide bzw. ‐selenide, RP(X)H2 (X = S, Se), die 31P‐NMR‐ spektroskopisch charakterisiert werden können. Die Bildung von Organylphosphanmonosulfiden ist auch bei der Umsetzung primärer Phosphane mit 2,4‐Diaryl‐1,3,2,4‐dithiadiphosphetan‐2,4‐disulfid nachweisbar. Praktisch ohne Nebenprodukte verläuft die Reaktion primärer Phosphane mit Schwefel oder Selen und einer Reihe von Ketonen. Es entstehen die meist kristallinen (1‐Hydroxyalkyl)‐organyl‐phosphansulfide bzw. ‐selenide, RP(X)(H)C(OH)R1R2. Die Röntgen‐Kristallstrukturanalyse des (1‐Hydroxy‐1‐methyl‐ethyl)‐phenyl‐phosphansulfids (R = Ph, R1 = R2 = Me) ergab, daß im Kristall intermolekulare OH …︁ S‐Wasserstoffbrückenbindungen (O …︁ S = 328 pm) zu einer kettenförmigen Anordnung der Moleküle führen. Aldehyde reagieren mit Phenylphosphan und Schwefel zu Bis(1‐hydroxyalkyl)‐phenyl‐phosphansulfiden, C6H5P(S)[CH(OH)R1]2. 1H, 13C und 31P‐NMR‐Untersuchungen gestatten den Nachweis und die Zuordnung von auftretenden Stereoisomeren. Quantenchemische Berechnungen spiegeln richtig wider, welche Carbonylverbindungen in der Lage sind, mit dem intermediär gebildeten Phosphansulfid zu reagieren und welche nicht.
Synthesis and Structure of the First Tellurium‐Containing Borazine Derivative and a Tellurium‐Containing Boron – Nitrogen Spirocyclic Compound
We describe the synthesis of the first tellurium‐containing borazine derivative MeN[PhBN(Me)]2TeCl2 (2). Compound 2 has been prepared by the reaction of MeN[PhBN(Me)SiMe3]2 and TeCl4. The spirocyclic compound [PhB(tBuN)2]2Te (4) has been synthesized by the reaction of PhB(tBuNLi)2 (3) with TeCl4 in a molar ratio of 2:1. The single‐crystal X‐ray structures of 2 and 4 are reported.
Te-N compounds with Ph2SN and Ph2CN ligands were synthesized by treating TeCl4, TeF4, and ArTeCl3 (Ar = p-MeOC6H4) with the corresponding silylated ligand precursors 1 and 5. The 125Te NMR spectra of the compounds Cl3TeNSPh2 2, Cl2Te(NSPh2)2 3, ArTe(Cl2)NSPh2 4, Cl2Te(NCPh2)2 6, F2Te(NCPh2)2 7 and ArTe(Cl2)NCPh2 8 have been determined. The X-ray structures of the compounds 2 · Pyridin, 3 and 8 show Cl-bridged dimers in the solid state, while 6 and 7 · 0.5 MeCN are monomeric. In the diphenylsulfiminates 2 · Pyridin and 3 short Te-N bond distances are found.
Isolable, well‐defined alkali metal tellurolates—of interest for organic synthesis as well as for the production of transition metal tellurides—are only known with bulky organic groups. By lithiation and chalcogenation, the tellurolate 3 has now been obtained from 1 in quantitative yield via the intermediate 2. Subsequent reactions demonstrate the usefulness of such tellurolates.
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