Reactions of alkenes (ethylene, propene,
and 1-hexene) with water in the presence of
cis-Pt(Cl)
2(TPPTS)
2 (TPPTS = P(
m-C
6H
4SO
3Na)
3) produces stoichiometrically the Wackeroxidation product (acetaldehyde, acetone,
and 2-hexanone, respectively)
and trans-Pt(Cl)(H)(TPPTS)
2. The presence of the phosphine lig
ands provides stability to the hydride complexsuch that decomposition to the metal is prevented. For C
2H
4 the final product is
trans-Pt(Cl)(C
2H
5)(TPPTS)
2. These reactions are fully consistent with the PdCl
42- oxidation of alkenes.At higher temperatures, however, C
2H
4 is catalytically oxidized to CH
3CHO in a mechanismthat appears to be different. At 95
![](/images/entities/deg.gif)
C, 90 turnovers are observed.