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Reagents, lanthanide NMR shift

The first report of a cycloaddition reaction in the presence of an optically active catalyst13 appeared in 198314a. The dienes 14 add to benzaldehyde in the presence of 1 mol% of the chiral lanthanide NMR shift reagent Eu (hfc)3, i.e. tris[3-(heptafluoropropyl-hydroxymethylene)-(+)-camphorato]-europium(III), to give, after treatment with trifluo-roacetic acid, the dihydro-y-pyrone 15 enriched in the (R)-enantiomer, the degree of... [Pg.485]

A highly consistent correlation was observed between the absolute configuration of a-amino acids and the shift of their a-proton signals induced by the chiral lanthanide NMR shift reagent l,2-propanediaminetetraacetatoeuropium(III)60. Shift differences at a molar ratio of 0.02-... [Pg.277]

A new method for the determination of the enantiomeric purity of isoquinoline alkaloids makes use of chiral lanthanide NMR shift reagents... [Pg.403]

Unusually Volatile and Soluble Metal Chelates Lanthanide NMR Shift Reagents... [Pg.222]

See other pages where Reagents, lanthanide NMR shift is mentioned: [Pg.1068]    [Pg.779]    [Pg.783]    [Pg.785]    [Pg.787]    [Pg.789]    [Pg.791]    [Pg.793]    [Pg.795]    [Pg.797]    [Pg.799]    [Pg.801]    [Pg.803]    [Pg.805]    [Pg.807]    [Pg.809]    [Pg.811]    [Pg.813]    [Pg.815]    [Pg.817]    [Pg.819]    [Pg.821]    [Pg.823]    [Pg.825]    [Pg.827]    [Pg.829]    [Pg.831]    [Pg.833]    [Pg.835]    [Pg.837]    [Pg.839]    [Pg.841]    [Pg.843]    [Pg.998]    [Pg.1000]    [Pg.25]    [Pg.223]    [Pg.225]   
See also in sourсe #XX -- [ Pg.779 ]

See also in sourсe #XX -- [ Pg.222 ]



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