Ap. Hansson et al., A BIS(CROWN-ETHER) ANALOG OF TROGERS BASE - RECOGNITION OF ACHIRAL AND CHIRAL PRIMARY BISAMMONIUM SALTS, Tetrahedron letters, 39(25), 1998, pp. 4565-4568
A C-2-symmetric bis(18-crown-6) analogue (2) of Troger's base (1) has
been synthesized. In a series of achiral primary bisammonium salts, co
mpound 2 binds heptane-1,7-diylbis(ammonium chloride) most strongly. M
oderate enantioselective discrimination in the complexation of L-cysti
ne dimethyl ester dihydrochloride with rac-2 was observed. (C) 1998 El
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