Journal ArticleDOI
Synthesis of Imidazol-2-ylidenes by Reduction of Imidazole-2(3H)-thiones
Norbert Kuhn,Thomas Kratz +1 more
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TLDR
In this article, an improved synthesis of the title compounds was reported, and the N,N'-dialkylthioureas 1 with 3-hydroxy-2-butanone gave the imidazole-2(3H)-thiones 2 which on treatment with potassium in boiling tetrahydrofuran give the IMidazol-2ylidenes 3 in excellent yieldsAbstract:
An improved synthesis of the title compounds is reported. Reaction of the N,N'-dialkylthioureas 1 with 3-hydroxy-2-butanone gives the imidazole-2(3H)-thiones 2 which on treatment with potassium in boiling tetrahydrofuran give the imidazol-2-ylidenes 3 in excellent yieldsread more
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Journal ArticleDOI
Synthesis of Selected Cationic Pnictanes [LnPnX3–n]n+ (L = Imidazolium-2-yl; Pn = P, As; n = 1–3) and Replacement Reactions with Pseudohalogens
TL;DR: The reactions using various stoichiometries of [L((R/R'))SiMe3][OTf] and PnCl3 are less selective in the case of the heavier congeners or by decreasing steric demand of the R-group attached to the N atoms of the heterocycle.
Journal ArticleDOI
Studies of the ligand effect on the synthesis of dialuminoxanes by various β-diketiminato ligands.
TL;DR: The controlled hydrolysis of LAlMeCl with equimolar amounts of water in the presence of N-heterocyclic carbene gave a mixture of [LAl(Me)](2)(μ-O) (7) and dimeric[LAlMe(μ-OH](2) (8).
Journal ArticleDOI
N-Heterocyclic Carbene-Ytterbium Amide as a Recyclable Homogeneous Precatalyst for Hydrophosphination of Alkenes and Alkynes.
Jia Yuan,Hongfan Hu,Chunming Cui +2 more
TL;DR: To the best of the knowledge, complex 1 represents the first rare-earth complex that can be recovered after catalytic reactions and found that complex 3 could catalyze the polymerization of styrene to yield atactic polystyrenes with low molecular weights.
Book ChapterDOI
Routes to N-Heterocyclic Carbene Complexes
TL;DR: In this paper, the authors describe the methods that are most often used in the preparation of N-heterocyclic carbene (NHC) complexes, including insertion of a metal into the C = C bond of bis(imidazolidin-2-ylidene) olefins, use of carbene adducts or protected forms of free NHC carbenes, deprotonation of an azolium salt with a base, transmetallation from an Ag-NHC complex prepared from direct reaction of an imidazol
Journal ArticleDOI
Adducts of aluminum and gallium trichloride with a N-heterocyclic carbene and an adduct of aluminum trichloride with a thione
TL;DR: In this article, a 1:1 adduct of 1,3,4,5-tetramethylimidazole-2(3H)-thione with AlCl3 was obtained in toluene.