420783-01-3Relevant academic research and scientific papers
Novel structure-defined chiral bis(oxazolinyl)thiophenes for Ru-catalyzed asymmetric cyclopropanation
Gao, Ming Z.,Kong, Deyuan,Clearfield, Abraham,Zingaro, Ralph A.
, p. 5649 - 5652 (2004)
The novel structures of sulfur-containing chiral bis(oxazoline) compounds which have been synthesized have been determined by X-ray crystal diffraction analyses. A high enantioselectivity (ee>99%) in the asymmetric cyclopropanation of diphenylethene with
Synthesis and structures of new chiral diamide-ester macrocycles
Gao, Ming Zhang,Reibenspies, Joseph H.,Wang, Bo,Xu, Zun Le,Zingaro, Ralph A.
, p. 899 - 908 (2007/10/03)
A series of new hetero-macrocyclic diamide-ester compounds (4a - 4z, 6a - 6b) were synthesized using 4-(dimethylamino)pyridine as catalyst and characterization by infrared spectra, nuclear magnetic resonance spectra, mass spectra and elemental analyses. The structures of 4e and meso 4b were determined by X-ray crystallography. The association constants of the compounds with various metal ions were determined by UV-visible spectroscopic titration, and showed a selective recognition for certain metal ions.
