Journal ArticleDOI
Synthesis of Imidazol-2-ylidenes by Reduction of Imidazole-2(3H)-thiones
Norbert Kuhn,Thomas Kratz +1 more
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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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Experimental and computational studies on the mechanism of zwitterionic ring-opening polymerization of δ-valerolactone with N-heterocyclic carbenes.
Ashwin K. Acharya,Young A. Chang,Gavin O. Jones,Julia E. Rice,James L. Hedrick,Hans Horn,Robert M. Waymouth +6 more
TL;DR: DFT calculations indicate that the highest activation barrier of the entire mechanism is associated with the ring-opening of the tetrahedral intermediate formed from the NHC and δ-valerolactone, a result consistent with inefficient initiation to generate reactive zwitterions.
Journal ArticleDOI
On the Bonding in N-Heterocyclic Carbene Complexes of Germanium(II)
Adam J. Ruddy,Paul A. Rupar,Kamila J. Bladek,Christopher J. Allan,Jessica C. Avery,Kim M. Baines +5 more
TL;DR: In this article, a series of N-heterocyclic carbene (NHC) complexes of Ge(II) were synthesized and structurally characterized, and it was shown that the carbenic carbon−germanium bond length does not vary systematically with the electronic demands of the substituents on the germanium center.
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Design of cationic mixed phosphine/N-Heterocyclic carbene palladium(II) pi-Allyl complexes as monoligated phosphine Pd(0) precatalysts: synthesis, structural studies, catalysis, and reactivity
TL;DR: In this article, the double-bond character of the allyl trans to the phosphine ligand was observed in the parent [Pd(L)Cl(NHC)(L′)] complexes and a perpendicular orientation of the NHC was observed.
Journal ArticleDOI
Borabenzene Derivatives. 33. 3,5-Dimethylborabenzene 1,3,4,5-Tetramethylimidazol-2-ylidene: The First Carbene Adduct of a Borabenzene1
TL;DR: The stable carbene 1,2,3,5-tetramethylimidazol-2-ylidene forms an adduct with 3,5dimethylborabenzene as mentioned in this paper.
Journal ArticleDOI
Rhenium and technetium complexes with N-heterocyclic carbenes – A review
TL;DR: In this article, the coordination chemistry of technetium and rhenium with N-heterocyclic carbenes of the dimethylimidazol-2-ylidene and 1,2,4-triazol -5-idene types is reviewed.