Chiral N-Heterocyclic Carbene Ligands Derived from 2,2‘-Bipiperidine and Partially Reduced Biisoquinoline: Rhodium and Iridium Complexes in Asymmetric Catalysis

Autor:	Tanasri Bunlaksananusorn, Eberhardt Herdtweck, Florian Rampf, Lars Rodefeld, Wolfgang A. Herrmann, Stephan D. Hoffmann, Denys Baskakov
Rok vydání:	2006
Předmět:	Ligand Transition metal carbene complex Organic Chemistry Enantioselective synthesis chemistry.chemical_element Rhodium Catalysis Inorganic Chemistry chemistry.chemical_compound Transmetalation chemistry Polymer chemistry Organic chemistry Iridium Physical and Theoretical Chemistry Carbene
Zdroj:	Organometallics. 25:2449-2456
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om060098b
Popis:	New and reliable procedures for the preparation of both enantiomers of 2,2‘-bipiperidine have been developed. Chiral imidazolinium salts derived from 2,2‘-bipiperidine and partially reduced biisoquinoline were prepared in high yields. Rhodium and iridium complexes of new chiral N-heterocyclic carbenes were obtained by transmetalation from corresponding silver(I) complexes. The structures of these complexes were verified by X-ray diffraction. The novel carbenes seem to range between the very electron-rich bis(amido)carbenes and the imidazole-derived carbenes with regard to the electronic ligand properties (IR evidence). Rhodium and iridium complexes were applied to a variety of catalytic asymmetric reactions. Modest enantioselectivities of up to 28% ee were observed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::57c88dfc63475971fd7686dba919e3c0 https://doi.org/10.1021/om060098b Zobrazit plný text záznamu