Structurally Characterized Lead(II) Alkoxides as Potent Ring-Opening Polymerization Catalysts
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https://figshare.com/articles/dataset/Structurally_Characterized_Lead_II_Alkoxides_as_Potent_Ring_Opening_Polymerization_Catalysts/2177971
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资源简介：
The lead(II) alkoxides [Pb(μ2-OiPr)2]∞ (2), [Pb(μ2-OiPr)(N(SiMe3)2)]2 (3), and [LiPb(μ2-OtBu)2(μ3-OtBu)]2 (5) have been synthesized
and fully
characterized, including by X-ray diffraction methods and 207Pb solution NMR spectroscopy. Original and varying coordination patterns
about the metal atoms are illustrated in these complexes, which represent
valuable additions to the limited set of lead(II) alkoxides that have
already been structurally characterized. The heteroleptic complex 3 is accessed via simple alcoholysis of Pb[N(SiMe3)2]2, and this constitutes a convenient alternative
to Sita’s heterocumulene route. Plumbylenes 2, 3, and 5 act as competent (pre)catalysts for
the living ring-opening polymerization of lactides. With 2, as little as 50 ppm of metal are required to yield poly(lactide)
in a controlled fashion during reactions performed under immortal
conditions in the presence of excess alcohol as a co-initiator. Across
the homogeneous series of tetrelenes [M(μ2-OiPr)2]n, the ROP
catalytic activity increases very substantially according to M = Ge(II)
≪ Sn(II) < Pb(II).
创建时间：
2016-02-13
