کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1307677 | 975149 | 2011 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of trifluoroborate functionalised imidazolium salts as precursors to weakly coordinating bidentate NHC ligands Synthesis of trifluoroborate functionalised imidazolium salts as precursors to weakly coordinating bidentate NHC ligands](/preview/png/1307677.png)
A new class of trifluoroborate functionalised N-heterocyclic carbene precursors have been synthesised, isolated and characterised structurally. The ligands were obtained via a serendipitous one-pot reaction in which deprotection, cyclisation and fluorination of boryl-functionalised diarylethylenediamine derivatives occur concurrently. Deprotonation of the imidazolium salts was found to yield the free carbene, though 18-crown-6 was found necessary to prevent further reactivity of the resulting aryl potassium trifluoroborate salts; in the absence of 18-crown-6, elimination of KF resulted in a cyclic carbene–BF2 arene adduct. Complexation to rhodium was facile, and yielded four-coordinate complexes in which the Rh–BF3 interaction was determined by 19F NMR spectroscopy to be weak.
Trifluoroborate functionalised N-heterocyclic carbene ligands were synthesised by a one pot, three step synthesis. The coordination behaviour of the trifluoroborate moiety to a rhodium centre was revealed to be weak by 19F NMR spectroscopy.Figure optionsDownload as PowerPoint slideResearch highlights
► Trifluoroborate functionalised N-heterocyclic carbenes were synthesised.
► The synthesis was aided by an unforeseen one-pot, three step reaction.
► Coordination to rhodium was facile via the carbene.
► The binding of the trifluoroborate moiety to Rh was weak, as determined by 19F NMR.
Journal: Inorganica Chimica Acta - Volume 369, Issue 1, 15 April 2011, Pages 180–189