Concerted reductive coupling of an alkyl chloride at Pt(Ⅳ)

摘要

Oxidation of a doubly cyclometallated platinum(Ⅱ) complex results in two isomeric platinum(Ⅳ) complexes. Whereas the trans isomer is robust, being manipulate in air at room temperature, the cis isomer decomposes at -20 ℃ and above. Reductive coupling of an alkyl chloride at the cis isomer gives a new species which can be reoxidised. The independence of this coupling on additional halide rules out the reverse of an SN2 reaction, leaving a concerted process as the only sensible reaction pathway.