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Enantiomer composition determination aminals

Similarly, Mosher-type amines have been introduced for determining the enantiomer composition of chiral carboxylic acids (Fig. 1-10)27 ... [Pg.23]

The displacement of halogen from phosphonic dihalides with thiols in the presence of an appropriate base leads to 5,S-diesters rather than (9,5-isomers (equation 30 Z = 0)2-7374,375 gych a reaction has been employed in the determination of the enantiomer composition of chiral thiols. The NMR spectra for a series of phosphonodithioates 163 (Z = O, R = Me, Ph, PhCH2) and also for analogous trithiophosphonates 163 (Z = S, R = Me or Ph) in which the group R is derived from a chiral thiol, showed that the best separation of P NMR signals for the diastereoisomeric forms was achieved when R = Me. Displacement reactions which involve the loss of chlorine from R2P(Z)C1 (Z = or Se ). RP(0)(SR )CP and RP(S)(NHR )C1 by thiols in the presence of a tertiary amine base, and many more, are widely exemplified. [Pg.457]

See other pages where Enantiomer composition determination aminals is mentioned: [Pg.22]    [Pg.26]    [Pg.420]    [Pg.19]    [Pg.125]    [Pg.1091]    [Pg.365]    [Pg.421]    [Pg.80]    [Pg.204]    [Pg.125]    [Pg.57]    [Pg.328]    [Pg.1667]   
See also in sourсe #XX -- [ Pg.24 , Pg.25 ]



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