Tetrahedron Letters p. 7169 - 7172 (1990)
Update date:2022-08-10
Topics:
Iwamoto
Fujimoto
Matsuda
Shinkai
It was found that the conformer distribution in tetra-O-substitution of p-t-butylcalix[4]arene is remarkably affected by metal species in base: in particular, 100% 'cone' selectivity in the presence of Na2CO3 is changed to 100% 'partial cone' selectivity in the presence of Cs2CO3 in the reaction with ethyl bromoacetate.
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