618912-10-0Relevant articles and documents
Mercurated and palladated iminophosphoranes. Synthesis and reactivity
Vicente, Jose,Abad, Jose-Antonio,Clemente, Rafael,Lopez-Serrano, Joaquin,De Arellano, M. Carmen Ramirez,Jones, Peter G.,Bautista, Delia
, p. 4248 - 4259 (2003)
Reaction of the iminophosphorane Ph3P=NC6H4Me-4 (1a) with Hg(OAc)2 and LiCl gives the mercurated iminophosphorane [Hg{C6H3(N=PPh3)-2-Me-5}Cl] (2). The latter reacts with NaBr to give [Hg{C6H3(N=PPh3)-2-Me-5}Br] (3). 2 reacts with MeC6H4NCO-4 or CX2 (X = O, S) to give [Hg{C6H3(N=C=NC6H4Me-4′)-2-Me- 5}Cl] (4) or [Hg{C6H3{N=C=NC6H3(HgCl)-1′-Me -5′}-2-Me-5}Cl] (5), respectively. Iminophosphoranes Ph3P=NC6H4R-4 (1b) react with Pd(OAc)2 to give the complexes [Pd{κ2-C,N-C6H4(PPh2 =NC6H4R-4′)-2}(μ-OAc)]2 (R = Me (6a), MeO (6b)), in which the palladation takes place at one of the phenyl substituents of the PPh3 group. Complex 6b reacts with NaBr or tBuNC to give [Pd{κ2-C,N-C6H4 (PPh2=NC6H4OMe-4′)-2} (μ-Br)]2 (7) or [Pd{κ2-C,N-C6 H4(PPh2=NC6H4OMe-4′)-2}(OAc) (CNtBu)] (8), respectively. Complexes 6a,b react with NaClO4 and N,N,N′,N′-tetramethylethylenediamine (tmeda), yielding [Pd{κ2-C,N-C6H4(PPh2 =NC6H4R-4′)-2}(tmeda)] ClO4 (R = Me (9a), MeO (9b)). The compound Ph3P=NC6H4I-2 (1c) adds oxidatively to [Pd2(dba)3]?dba (dba = dibenzylideneacetone) in the presence of tmeda, resulting in the formation of complex [Pd{C6H4(N=PPh3)-2}I(tmeda)] (10). The complex 10 reacts (i) with PPh3 and TlOTf (TfO = CF3SO3) to give [Pd{C6H4(N=PPh3)-2}(tmeda)(PPh3)]TfO (11·TfO), (ii) with XyNC (Xy = C6H3Me-2,6) (1:3 molar ratio) to give [Pd{κ2-C,N-C(=NXy)C6H4(N=PPh3) -2}I (CNXy)] (12), and (iii) with XyNC and TlOTf (1:3:1) to give [Pd{κ2-C,N-C(=NXy)C6H4(N=PPh3) -2}(CNXy)2] TfO (13). An excess of the alkyne MeO2CC≡CCO2Me reacts with 10 and AgClO4 (4:1:1) to give the inserted compound [Pd{κ2-C,N-C(CO2Me)=C(CO2Me)C6 H4(N=PPh3)-2}(tmeda)] ClO4 (14·ClO4). The crystal structures of 2, 6a·CH2Cl2, 9a, 11·TfO, and 14·ClO4 have been determined by X-ray diffraction studies.