Synthesis of N-heterocyclic carbene palladium(II) bis-phosphine complexes and their decomposition in the presence of aryl halides

4468 10 archive 337 disk0/00/00/44/68 2008-04-07 14:41:00 2008-07-18 10:50:24 2008-07-16 17:07:46 article show Alison.Magill@utas.edu.au Magill AM Alison.Magill@utas.edu.au Yates BF Brian.Yates@utas.edu.au Cavell KJ k.j.cavell@utas.edu.au Skelton BW White AH Synthesis of N-heterocyclic carbene palladium(II) bis-phosphine complexes and their decomposition in the presence of aryl halides pub 039904 259901 970103 780103 restricted Copyright © 2007 Royal Society of Chemistry category => A1 categoryDesc => Refereed Article in a Scholarly Journal eprintID => 0 field1 => Dalton Transactions field10 => field11 => field12 => field13 => field2 => Cambridge field3 => field4 => 31 field5 => 3398-2406 field6 => Royal Society of Chemistry field7 => 1477-9226 field8 => field9 => funding => Q grant => lastUpdate => 13/03/2008 rfcd => 259901 seo => 780103 themeArea => FT title => Synthesis of N-heterocyclic carbene palladium(II) bis-phosphine complexes and their decomposition in the presence of aryl halides tor => SB uid => 51079 update => no Methylpalladium(II) carbene complexes of the type [Pd(NHC)Me(P–P)]BF4 (NHC = N-heterocyclic carbene, P–P = chelating phosphine) have been synthesised, the complex [Pd(tmiy)Me(dcype)]BF4 (tmiy = 1,3,4,5-tetramethylimidazol-2-ylidene, dcype = 1,2-bis(dicyclohexylphosphino)ethane) being characterised crystallographically. Complexes bearing the tmiy ligands were shown to decompose in an analogous manner to complexes bearing monodentate phosphine ligands, with the rate of decomposition being nominally linked to the size of the chelate ring. The decomposition of these complexes in the presence of aryl halides—expected to yield Pd(Ar)X(P–P)—was studied and shown instead to yield PdX2(P–P) and [Pd(tmiy)X(P–P)]BF4. Additionally, Pd(Me)X(P–P) and Pd(Ar)X(P–P) were observed in some cases. Intermolecular cross-over reactions between the starting complex and Pd(Ar)X(P–P) were found to be the source of these unexpected products. 2007 published Dalton Transactions 31 Royal Society of Chemistry 3398-2406 10.1039/b706053j TRUE 1477-9226 http://dx.doi.org/10.1039/b706053j 4872 3 4468 1 application/pdf en staffonly cc_utas

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