New routes to the synthesis of chloro-carbonyls of palladium(II) and platinum(II)

[Pt(CO)x]n (x∼2), the already described species obtained by the reaction of platinum(0) olefin complexes with carbon monoxide, reacts promptly at room temperature with SO2Cl2 under CO affording cis-PtCl2(CO)2. [Pd2(CO)y]n (y∼1), obtained by Pd(dba)2 and CO at room temperature, reacts in the same conditions yielding Pd2Cl4(CO)2. Similarly, although more slowly, finely divided platinum and palladium, in the form of metal blacks, react with SO2Cl2 and CO at room temperature producing again cis-PtCl2(CO)2 and Pd2Cl4(CO)2, respectively. In the absence of CO no reaction is observed within 4 weeks.