Chelated unsymmetrical triphosphine ligands of the type R2PCH2CH2CH2P(Ph)CH,CH2PR'2 and R2PCH2CH2CH2P-(Ph)CH2CH2CH2PRt2 (R = R' = C&; R = R' = C6Hll; R = C6Hl1, R' = C6H5) can be synthesized rapidly on platinum by Et3N-catalyzed condensation of simpler phosphine units onto a coordinated secondary phosphine. The resulting [PtCl(triphos)]X (X = C1, AsF6) complexes are characterized by elemental analyses and by 'H, 3'P, and lssPt NMR spectroscopy. For those complexes that contain a five-membered chelate ring, the IgSPt 6 values are shifted to higher fields, whereas the 6 values are shifted to lower fields, when compared with analogous phosphino groups in six-membered chelate rings.

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Pt‐ und Pd‐dihailogcnide bilden mit den tert.‐sek.

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