Reactions of alkenes (ethylene, propene, and 1-hexene) with water in the presence of cis -Pt(Cl) 2 (TPPTS) 2 (TPPTS = P( m -C 6 H 4 SO 3 Na) 3 ) produces stoichiometrically the Wacker oxidation product (acetaldehyde, acetone, and 2-hexanone, respectively) and trans -Pt(Cl)(H)(TPPTS) 2 . The presence of the phosphine ligands provides stability to the hydride complex such that decomposition to the metal is prevented. For C 2 H 4 the final product is trans -Pt(Cl)(C 2 H 5 )(TPPTS) 2 . These reactions are fully consistent with the PdCl 4 2 - oxidation of alkenes. At higher temperatures, however, C 2 H 4 is catalytically oxidized to CH 3 CHO in a mechanism that appears to be different. At 95 °C, 90 turnovers are observed.
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Helfer et al. (2004) studied this question.
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