717110-52-6Relevant academic research and scientific papers
Dialkylgallium complexes with alkoxide and aryloxide ligands possessing N-heterocyclic carbene functionalities: Synthesis and structure
Horeglad, Pawel,Ablialimov, Osman,Szczepaniak, Grzegorz,Daibrowska, Anna Maria,Dranka, Maciej,Zachara, Janusz
, p. 100 - 111 (2014/02/14)
Methods for the synthesis of dialkylgalium compounds with alkoxide or aryloxide ligands possessing N-heterocyclic carbene functionalities have been established. As a result, the synthesis of a series of dialkylgallium complexes Me2Ga(O,C) (1, 3-5), and Me2Ga(O,C)·Me 3Ga (2, 6) is described, where (O,C) represents an alkoxide or aryloxide monoanionic chelate ligand with an N-heterocyclic carbene functionality. All complexes have been fully characterized using spectroscopic and X-ray techniques. The presence of a strongly basic NHC functionality in alkoxide or aryloxide ligands resulted in the formation of monomeric Me 2Ga(O,C) species. The reaction of those complexes with the Lewis acid Me3Ga leads to Me2Ga(O,C)·Me3Ga adducts (2 and 6) with a strong Me3Ga-O dative bond. The effect of (O,C) ligands with various steric and electronic properties on the structure of obtained Me2Ga(O,C) and Me2Ga(O,C)·Me3Ga has been discussed on the basis of spectroscopic data. Finally, the bond valence vector model has been used to estimate the effect of a chelating (O,C) ligand on strains in complexes 1-6 on the basis of X-ray data.
Modular trimethylene-linked bisimidazol(in)ium salts
Bessel, Michael,Rominger, Frank,Straub, Bernd F.
experimental part, p. 1459 - 1466 (2010/10/20)
A short and modular synthesis of symmetrically and non-symmetrically substituted bisimidazolinylene N-heterocyclic carbene precursors is described. Two methods to establish dicopper(I) complexes of these compounds depending on the steric shielding of the
Modular synthesis of heterocyclic carbene precursors
Paczal, Attila,Benyei, Attila C.,Kotschy, Andras
, p. 5969 - 5979 (2007/10/03)
A series of N-heterocyclic carbene precursors, containing an imidazoline or tetrahydropyrimidine framework, were prepared from ω-chloroalkanoyl chlorides. The sequential attachment of nitrogen nucleophiles and subsequent ring closure gave, depending on the reagents used, either the desired dihydroimidazolium and tetrahydropyrimidinium salts or their parent heterocycles. In this latter case, the second substituent was introduced in an alkylation step. The preparation of carbene precursors bearing chiral or bulky substituents was achieved with comparable efficiency.
Steric variations between the synthesis of a stable chiral C 2-symmetric diimidazolidinylidene and an electron-rich tetraazafulvalene
Marshall, Colin,Ward, Mark F.,Skakle, Janet M. S.
, p. 1040 - 1044 (2007/10/03)
C2-Symmetric electron-rich olefin dimers and imidazolidinylidene ligands with a 2,2-dimethyl-1,3-dioxolane backbone were synthesised and characterised. The steric protection of the carbene dictates which product is obtained. Georg Thieme Verlag
Synthesis and study of 1-aryl-1H-4,5-dihydroimidazoles
Perillo, Isabel,Caterina, M. Cristina,Lopez, Julieta,Salerno, Alejandra
, p. 851 - 856 (2007/10/03)
An easy synthesis of 1-aryl-1H-4,5-dihydroimidazoles 1 by cyclocondensation of N-aryl-N′-formylethylenediamines 2 is described. Such precursors were synthesized by selective formylation of N-arylethylenediamines 3 with p-nitrophenyl formate. Cyclizations were performed using trimethylsilyl polyphosphate. Chemical properties of compounds 1, typical of amidine system, were studied. Reaction of 1 with methyl iodide leads to the corresponding 1-aryl-3-methyl-1H-4,5-dihydroimidazolium salts 5. Reduction of dihydroimidazoles 1 with sodium cyanoborohydride provides a convenient access to N-aryl-N′-methylethylenediamines 4.
