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Chiral tridentate bis(oxazol-2-ylimino) isoindoline-based pincer ligands: isolation and characterizationviadeligation fromin situprepared Cd-ligand complexes

Dalton Transactions, ISSN: 1477-9234, Vol: 50, Issue: 29, Page: 10041-10049
2021
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Article Description

The first isolation and structural characterization of a series of chiral trinitrogen 1,3-bis(4,5-dihydrooxazol-2-ylimino)isoindoline-based pincer ligands are reported. Cadmium complexes, isolated as Cd(LX)where LX is the deprotonated form of LXH = 1,3-bis(4,5-dihydro-4-(R)-phenyloxazol-2-ylimino)-isoindoline ((R,R)-5H) or 1,3-bis(4,5-dihydro-4-(S)-iso-propyloxazol-2-ylimino)isoindoline ((S,S)-6H) were preparedin situ viatraditional or microwave-based techniques with the latter being more efficient but less able to be scaled up at this time. Ligands (R,R)-5H and (S,S)-6H were isolatedviadeligation from their respective cadmium complexes using a thiol-based ligand exchange protocol. The characterization of ligands and their respective cadmium complexes, in both the solid (X-ray crystallography) and solution (NMR spectroscopy) states are reported. Pd((S,S)-6)(OAc) is reported as a proof-of-concept of the ability to prepare 1 : 1 ligand to metal ratio complexes that are believed to be necessary as potential enantioselective catalysts.

Bibliographic Details

Zivkovic, Kristina; Baldauf, Lilia M; Cryder, Jessica L; Villaseñor, Alexa; Reyes, Valeria; Bernier, Lauren E; Thomas, Theresa J; O'Toole, Maxwell; Fulton, Kayleen; Moore, Curtis E; Rheingold, Arnold L; Daley, Christopher J A

Royal Society of Chemistry (RSC)

Chemistry

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