Algebraic Topology

Dieck, Tammo tom

doi:10.4171/048

Cited by 173 publications

(112 citation statements)

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“…The starting materials 1 and 2 were prepared according to published procedures. [29,30] The alkali metals were purchased from Sigma-Aldrich and stored in a dry box prior to use. The NMR spectra were recorded in [D 8 ]THF solutions on a Bruker AVIII 400 (5 mm BBO, 1 H: 400.1 MHz; 13 C: 100.6 MHz; 7 Li: 155.5 MHz) at ambient temperature.…”

Section: Methodsmentioning

confidence: 99%

“…of 2,6-diisopropylaniline. [29,30] A few structurally characterized alkali metal enediamide complexes derived from 1 and 2 have been reported previously. These include lithium, sodium and potassium derivatives of 1, [11,31,32] 2, [33,34] Ph2 DAD pTol (pTol = para-tolyl), [35] and additionally functionalized derivatives like (MePhN)2 DAD pTol [36] and R2 DAD CH2Py (R 2 = buta-1,4-diyl, CH 2 Py = CH 2 -4-pyridyl) [37] (cf.…”

Section: Introductionmentioning

confidence: 99%

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The Manifold Structural Chemistry of Alkali Metal Enediamide Complexes

et al. 2019

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New alkali metal (M = Li, Na, K) enediamide complexes derived from 1,4‐diaza‐1,3‐dienes (= DADs) have been synthesized and structurally characterized. The complexes were prepared by direct metalation of either 1,4‐bis(2,6‐diisopropylphenyl)‐1,4‐diaza‐1,3‐butadiene (1, = H2DADDipp) or 1,4‐bis(2,6‐diisopropylphenyl)‐2,3‐dimethyl‐1,4‐diaza‐1,3‐butadiene (2, = Me2DADDipp) with an excess of the respective alkali metals in donor solvents such as THF or DME. All new complexes were fully characterized by spectroscopic methods and X‐ray crystallography.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Manifold Structural Chemistry of Alkali Metal Enediamide Complexes

et al. 2019

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“…The studied ligands were synthesized by following the literature procedures, which are based on condensation reactions between the desired naphthylamine and either the acenaphthenequinone [24,39] for 1 BIAN [34] and 2 BIAN, or the 2,3-butanedione [40] for 1 DAB and 2 DAB. [35] The only difference with respect to the literature procedures concerns the DAB ligands, which were obtained with yields of 50 % by simply leaving the reaction mixture for 1 d at room temperature, and not under heating to reflux for the same time as recently reported.…”

Section: Synthesis and Characterization Of Ligands And Their Pd II Comentioning

confidence: 99%

Analogies and Differences in Palladium‐Catalyzed CO/Styrene and Ethylene/Methyl Acrylate Copolymerization Reactions

et al. 2014

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The catalytic CO/styrene and ethylene/methyl acrylate copolymerizations are compared for the first time by applying the same precatalysts. With this aim, PdII neutral, [Pd(CH3)Cl(N–N)], and monocationic, [Pd(CH3)(L)(N–N)][PF6] (L=CH3CN, DMSO), complexes with 1-naphthyl- and 2-naphthyl-substitued α-diimines with both an acenaphthene and a diazabutadiene skeleton as chelating nitrogen-donor ligands (N–N) have been studied. In the case of the complexes with the 1-naphthyl-substituted ligands, syn and anti isomers are found both in solid state and in solution. All the monocationic complexes generate active catalysts for the CO/styrene copolymerization leading to atactic or isotactic/atactic stereoblock copolymers depending on the ligand bonded to palladium. Instead, in the case of the ethylene/methyl acrylate copolymerization only the complexes with the 1-naphthyl-substituted ligands generate catalysts for this reaction

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“…[11] The octahedral nickel complex 1 was isolated from this reaction mixture as purple crystals and was characterized by elemental analysis, mass spectrometry, X-ray crystal structure analysis (Figure 1), heteronuclear NMR spectroscopy (Figures 3 and 4) and 119 Sn Mössbauer spectroscopy ( Figure 6).The octaanionic complex [Ni(SnB 11 H 11 ) 6 ] 8À with nickel in the formal oxidation state IV is the product of an oxidation reaction, raising the question of the corresponding reduction product. It has been reported that [Ni(dab)Br 2 ] (dab = 1,4diaza-1,3-butadiene or a-diimine) can readily be reduced in the presence of additional dab, resulting in the formation of [Ni(dab) 2 ] [12][13][14] with nickel in its common oxidation state II and anionic radical dab ligands. [15][16][17][18] To our knowledge, the reduction product [Ni(dpp-bian) 2 ] has not been reported to date, and we were not able to identify the dark violet compound in the remaining reaction mixture (Scheme 1).…”

mentioning

confidence: 99%