2284
T. Haino et al. / Tetrahedron Letters 45 (2004) 2281–2284
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In conclusion, we developed the upper rim functional-
ized calix[4]arene receptor having two urea groups,
capable of binding selectively to the dicarboxylates over
the monocarboxylate. The shape selective recognition
among the dicarboxylates were achieved. Molecular
mechanics calculation gave a helpful information for the
rational explanation of the selectivity.
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