Journal
POLYHEDRON
Volume 52, Issue -, Pages 810-819Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2012.07.046
Keywords
Carbene; Catalyst; In situ; Chiral; Enantioselective; Asymmetric
Categories
Funding
- UF
- NSF [CHE-0821346]
- Alfred P. Sloan Fellowship
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To simplify catalytic reactions employing chelating bisNHC-metal complexes, studies were conducted to elucidate conditions for the in situ generation of a chiral chelating bisNHC-palladium catalyst from the corresponding diimidazolium salt. The method provides a convenient entry to catalytic reactions and eliminates catalyst preparation steps. In addition to the in situ prepared catalyst, for comparative purposes, isolable species were synthesized and characterized by NMR spectroscopy, combustion analysis, and single-crystal X-ray diffraction. Employing C-2-symmetric ligands derived from trans-9,10-Dihydro-9,10-EthanoAnthracene-11,12-diyl (DEA) and trans-9,10-Dihydro-9,10-EthanoAnthracene-11,12-diyl-Methanediyl (DEAM), diNHC-Pd complexes were synthesized and tested for activity in enantioselective arylboronic acid addition to cyclic enones. Published by Elsevier Ltd.
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