Enantiomeric resolution and determination of the absolute configuration of dibenzophosphole 5-oxides
摘要:
The resolution of asymmetrically substituted dibenzophospholes via chromatographic separation of their cyclopalladium derivatives is described for the first time. The absolute configuration of the phosphorus atom was determined by X-ray crystallographic analysis in one case. A general NMR criterion for the complete determination of the configuration of this group of products is proposed. The enantiomeric excess of the resolved compounds was determined by NMR Eu(III) chemical displacement experiments and by HPLC using a chiral stationary phase. (C) 2001 Elsevier Science Ltd. All rights reserved.
Enantiomeric resolution and determination of the absolute configuration of dibenzophosphole 5-oxides
摘要:
The resolution of asymmetrically substituted dibenzophospholes via chromatographic separation of their cyclopalladium derivatives is described for the first time. The absolute configuration of the phosphorus atom was determined by X-ray crystallographic analysis in one case. A general NMR criterion for the complete determination of the configuration of this group of products is proposed. The enantiomeric excess of the resolved compounds was determined by NMR Eu(III) chemical displacement experiments and by HPLC using a chiral stationary phase. (C) 2001 Elsevier Science Ltd. All rights reserved.
(S-p,S-c)-5-Ethyl-3-(2-methylbutoxy)-7-(4-undec-10-enoxyphenoxycarbonyl)-5H-dibenzophosphole 5-oxide, the first example in the literature of a new asymmetrically substituted dibenzophosphole-based group of systems with liquid-crystal properties is described. (C) 2001 Elsevier Science Ltd. All rights reserved.