Competitive Aryl-Iodide vs Aryl-Aryl Reductive Elimination Reactions in Pt(IV) Complexes: Experimental and Theoretical Studies

Anette Yahav-Levi, Israel Goldberg, Arkadi Vigalok*, Andrei N. Vedernikov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The platinum(IV) complex trans-(dmpe)PtIV(Ar)2I 2 (2, dmpe = 1,2-dimethylphosphinoethane, Ar = 4-FC6H 4) rapidly reacts, upon moderate heating in solution under ambient light, via two distinct pathways: isomerization to the corresponding cis-isomer (3) and Ar-I reductive elimination to give (dmpe)-PtII(Ar)I (4). Complex 3 undergoes, upon prolonged heating at high temperatures, an exclusive Ar-Ar reductive elimination reaction to give (dmpe)PtIII2. Experimental and DFT studies showed that the 2-to-3 isomerization proceeds via three pathways: photochemical or thermal phosphine chelate opening and a mechanism involving cleavage of the Pt-I bond. The isomerization reaction is significantly slowed down but not stopped in the absence of light or in the presence of an excess of tetra-n-butylammonium iodide. On the other hand, the Ar-I reductive elimination from 2 proceeds via the Ptδ+-I δ_ ion pairlike transition state. Use of the rigid dmpe analogue 1,2-dimethylphosphinobenzene (dmpbz) as the ligand shuts down the chelate ring-opening isomerization pathway and enables faster Ar-I reductive elimination thus making the latter reaction the major reaction route for the dmpbz supported trans-diiodo Pt(IV) complex 8.

Original languageEnglish
Pages (from-to)724-731
Number of pages8
JournalJournal of the American Chemical Society
Volume130
Issue number2
DOIs
StatePublished - 16 Jan 2008

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