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1
Content available remote

Can N-heterocyclic germylenes behave as Lewis acids - is there another side to Meller germylenes?

100%
Kühl O.
Open Chemistry
|
2008
|
vol. 6
|
issue 3
365-372
EN
N-Heterocyclic germylenes are known to exist in two structurally different forms, the planar Meller germylenes and the monoimino germylenes that feature an envelope structure. This essay reviews recent reports dealing with radical and cationic Meller type germylenes featuring the monoimino germylene structure, discusses their transformations and relationships, and asks the question whether indeed N-heterocyclic germylenes can be turned into Lewis acids. [...]
2
Content available remote

A hydroxyaminophosphane derived from 2-imidazolidone and its unusual structure in solution

63%
Kühl O., Heiden W.
Open Chemistry
|
2009
|
vol. 7
|
issue 3
281-284
EN
A novel hydroxyamino phosphane was synthesised through the reaction of 2-imidazolidinone with ClPPh2 and subsequently reaction of the resulting bisphosphino derivative with the Grignard reagent BrMgC5H11. The interaction of the pentyl substituent with one of the two phosphino groups and the structure in solution is shown by multinuclear NMR-spectroscopy.. [...]
3
Content available remote

Nickel and palladium complexes of enolatefunctionalised N-heterocyclic carbenes

51%
Shanmuganathan S., Kühl O., Jones P., Heinicke J.
Open Chemistry
|
2010
|
vol. 8
|
issue 5
992-998
EN
The reaction of chloroethyltrimethylsilylether with 1-methylimidazole furnishes an ionic liquid that undergoes methanolysis to crystalline 2-hydroxyethylimidazolium chloride (crystal structure presented). Conversion to defined hydroxyethylimidazol-2-ylidene nickel complexes failed, but was accomplished with 1-methyl-3-acetophenyl-imidazolium bromide. The bis(NHC⋂O−) nickel(II) chelate is formed, rather than a methallylnickel monochelate, but with nickelocene a monochelate NiCp complex was detected. The bulky 1-(2,6-diisopropylphenyl)-3-(2’-phenyl-enolato)-imidazol-2-ylidene allylpalladium chloride was obtained in pure form. Attempts to generate catalysts for ethylene oligomerization by in situ techniques have failed so far whereas P⋂O− ligands, comparable by the P-C diagonal relationship, provide active catalysts. [...]
4
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Functionalised, chiral imidazolium compounds from proteinogenic amino acids

51%
Kühl O., Millinghaus S., Wehage P.
Open Chemistry
|
2010
|
vol. 8
|
issue 6
1223-1226
EN
Chiral, carboxylic acid-functionalised imidazolium zwitterions were synthesised from the corresponding L-amino acids leucine, valine and isoleucine.
5
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Green, purple, blue - [Cu(N-Methylimidazole)n (OOCCH3)2]m, what is in a colour

51%
Kühl O., Millinghaus S., Palm G.
Open Chemistry
|
2011
|
vol. 9
|
issue 4
706-711
EN
Starting from the paddlewheel complex copper(II)acetate, the green N-methylimidazole adduct of copper(II)acetate is formed and transformed into the monomeric and dimeric N-methylimidazole adducts of copper(II)acetate [Cu(C4H6N2)2(CH3COO)2]n·xH2O (n = 1,2; x = 0, 6). The formation of the blue dimer or the purple monomer depends on the solvent and the presence or absence of water.
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