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The lanthanide chelates of(l)-2,2-dimethyl-6-trifluoromethyl-7-oxa-6,8,8,9,9,10,10,10-octafluoro-3,5-decanedione,Ln[(l)-CF_3CF_2CF_2OCF(CF_3)COCHCOC(CH_3)_3]_3(l-3a,Ln=Eu;3b, Ln=Pr), are useful as ~1H NMR shift reagents for direct determination of enantiomeric compositionof enantiomorphous alcohols. ketones and amines. With these substrates. l-3a induces shift differencesimilar to that induced by Eu(facam)_3 and Eu(hfbc)_3. However, due to the higher solubility of thechelates l-3a and l-3b in nonpolar organic solvent such as CHCl_3, CCl_4 and only one ~1H signal froml-3a and l-3b is observed. their application as the new chiral shift reagents seems promising. Thespectral nonequivalence is also observed for dimethylsulfoxide in the presence of l-3a.
The lanthanide chelates of (l) -2,2-dimethyl-6-trifluoromethyl-7-oxa-6,8,8,9,9,10,10,10-octafluoro-3,5-decanedione, Ln [ ) -CF_3CF_2CF_2OCF (CF_3) COCHCOC (CH_3) _3] _3 (1-3a, Ln = Eu; 3b, Ln = Pr) are useful as 1H NMR shift reagents for direct determination of enantiomeric composition of enantiomorphous alcohols. Ketones and amines. L-3a induces shift differences similar to that induced by Eu (facam) _3 and Eu (hfbc) _3. However, due to the higher solubility of thechelates l-3a and l-3b in nonpolar organic solvents such as CHCl_3, Their application as the new chiral shift experiments seem promising. The observation of nonequivalence is also observed for dimethylsulfoxide in the presence of 1-3a.