Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1321667 | Journal of Organometallic Chemistry | 2016 | 6 Pages |
•Reactivity of bis(alkynyl) iridium complexes [Cp*Ir(L)(CCAr)2].•Arbuzov-type reaction with phosphites to give four-membered iridacyclic phosphonates.•Acid-catalysed isomerisation to five-membered iridafurans•Acid-catalysed aerobic oxidation to form 1,2-diketone iridabenzofurans.•Common reaction pathway involving initial protonation and alkynyl migration.
The bis(alkynyl) iridium complexes [Cp*Ir(L)(CCAr)2] undergo an Arbuzov-type reaction with phosphites to give four-membered iridacyclic phosphonates [Cp*Ir(L){C(Ar)C[P(O)(OR)2]CCHAr}]. These can isomerise to a five-membered iridafuran in the presence of a strong acid. In the absence of a phosphite, the bis(alkynyl) iridium complexes undergo acid-catalysed aerobic oxidation to form 1,2-diketone iridabenzofurans [Cp*Ir(L){C6H4-1,2-CHCC(O)C(O)Ar}]. A common reaction pathway involving initial protonation and alkynyl migration is proposed.
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