Reactions of the cyclopalladated dimer {Pd(η2-L1)(μ-Cl)}2 (7) derived from N,N-dimethylbenzylamine (HL1) with lithium diphenylphosphide were studied under varied conditions. The LiPPh2 reagents used were purchased from Sigma-Aldrich Co. or synthesized from PPh3, ClPPh2, or HPPh2 by known general methods. Depending on the source of lithium phosphide, solvent, and reagent ratio, reactions of LiPPh2 with complex 7 resulted in the formation of different products. The commercial LiPPh2 solutions reacted with compound 7 and several other cyclopalladated dimeric complexes in THF to form the corresponding mononuclear derivatives with Ph2P(CH2)4OH as an auxiliary ligand, Pd(η2-L)Cl{PPh2(CH2)4OH}. The monophosphido-bridged analogue of dimer 7, {Pd(η2-L1)}2(μ-Cl)(μ-PPh2) (17), was the most common product of the 1:2 reactions of dimer 7 with other LiPPh2 solutions in THF. ortho-(Diphenylphosphino)-N,N-dimethylbenzylamine (20) was obtained in the reactions of complex 7 with the synthesized solutions of LiPPh2 using a 1:4.5 molar ratio of the reagents in THF or a 1:2 ratio in toluene. Possible mechanisms of these reactions are discussed.

No abstract

No abstract