Chiral Bis(Phospholane) PCP Pincer Complexes: Synthesis, Structure, and Nickel-Catalyzed Asymmetric Phosphine Alkylation
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https://figshare.com/articles/dataset/Chiral_Bis_Phospholane_PCP_Pincer_Complexes_Synthesis_Structure_and_Nickel-Catalyzed_Asymmetric_Phosphine_Alkylation/6621482
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资源简介：
A known
ligand precursor, prepared by an improved method from 1,3-bis(bromomethylbenzene),
a base, and (R,R)-2,5-dimethylphospholane-borane,
was deprotected with DABCO and used to prepare chiral m-xylene-based PCP pincer complexes. Reaction with Ni(DME)Br2 and NEt3 gave square planar Ni(DuPinPhos)(Br) (9), which was crystallographically characterized. Heating
with [Ir(COE)2Cl]2 yielded the dinuclear hydride
complex [Ir(DuPinPhos)(H)(Cl)]2(μ-C6H4(CH2-dimethylphospholanyl)2] (10), which contained both pincer chelates and a bridging bis(phospholane).
Nickel complex 9 was a catalyst precursor for enantioselective
alkylation of secondary phosphines with 2-bromomethylnaphthalene using
the base NaOSiMe3. The dynamic behavior of a catalytic
intermediate, the P-stereogenic terminal phosphido complex Ni(DuPinPhos)(PPhIs)
(Is = 2,4,6-(i-Pr)3C6H2), was characterized by variable temperature NMR spectroscopy.
创建时间：
2018-06-20
