Three bidentate N, O-magnesium complexes: Synthesis, characterization and their use as catalysts in transfer hydrogenation of ketones

Hua, Yupeng; Zhang, Yongbin; Chao, Jianbin; Wei, Xuehong

doi:10.1016/j.poly.2016.03.009

Cited by 2 publications

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“…The planar Mg 2 O 2 core is flanked by the two adjacent five-membered chelate rings O–C–C–N–Mg and Mg–N–C–C–N, each of which shares an N–Mg bond. The Mg(1)–O(2) (1.876(3) Å) or Mg(2)–O(4) (1.7277(14) Å) bond is shorter than any of the other Mg–O bonds (Mg(1)–O(1) 2.005(3) Å, Mg(1)–O(3) 2.011(3) Å, Mg(2)–O(1) 2.000(3) Å, Mg(2)–O(3) 2.016(3) Å), respectively, while the Mg–N bond (2.268–2.465 Å) is slightly longer than the previously reported Mg–N bond (2.1456–2.256 Å) …”

Section: Resultsmentioning

confidence: 99%

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N,N,O-Tridentate Mixed Lithium–Magnesium and Lithium–Aluminum Complexes: Synthesis, Characterization, and Catalytic Activities

2017

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The syntheses and crystal structures of a series of heterobimetallic Li/Mg and Li/Al complexes prepared from an N,N,O-tridentate ligand are described. The ligand HOC(CH2)5CH2N(Me)CH2CH2NMe2 (LH) and nBu2Mg were used to synthesize the homometallic magnesium alkoxide [{LMgOC(CH2)5CH2 N(Me)CH2CH2 NMe2}2] (1), which was reacted with nBuLi to afford the lithium alkylmagnesiate [{Bu2Mg{LiOC(CH2)5CH2 N(Me)CH2CH2 NMe2}}2] (2). Complex 2 was then hydrolyzed to produce [{BuMgOLi{LiOC(CH2)5CH2 N(Me)CH2CH2 NMe2}2}2] (3). The sequential reaction of LH in diethyl ether with RAlMe2 (R = Me, Cl) and nBuLi aforded two lithium aluminate complexes containing a polymeric structure of one-dimensional chains [{−LiOC(CH2)5CH2 N(Me)CH2CH2 NMe2}Al(Me)(n-Bu)CH3−} n ] (4) and [{−LiOC(CH2)5CH2 N(Me)CH2CH2 NMe2}Al(n-Bu)2CH2−} n ] (5), respectively. Each of the complexes 1–5 was structurally characterized and tested for its capability to catalyze Meerwein–Ponndorf–Verley (MPV) reactions. Heterobimetallic complexes 2 and 3 exhibited catalytic activities better than those of homometallic magnesium complex 1 and heterobimetallic lithium aluminate complexes 4 and 5 for MPV reactions.

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Section: Resultsmentioning

confidence: 99%

“…An ORTEP drawing of the molecular structure of complex 1 is shown in Figure 1 14 The molecular structure of complex 2 is shown in Figure 2. Complex 2 adopts a dimeric structure, where two anionic alkoxy ligands bridge two Li atoms via oxygen atoms, generating an Mg1O1Mg2O2 planar core in the center of the molecule.…”

Section: ■ Introductionmentioning

confidence: 99%