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Communication | Special issue | Vol 86, No. 1, 2012, pp.159-164
Published online, 3rd August, 2012
DOI: 10.3987/COM-12-S(N)48
SYNTHESIS OF p-CHLOROAZACALIX[5]ARENE PENTAMETHYL ETHER: RING SIZE-DEPENDENT DEPROTECTION OF N-BENZYL GROUPS

Hirohito Tsue,* Kazuyuki Miyata, Daisuke Takahashi, Hiroki Takahashi, Kohei Sasaki, and Rui Tamura

*Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan

Abstract

Syntheses of chlorinated azacalix[4]arene and azacalix[5]arene have been investigated. While the preparation of the former failed in the final N-debenzylation step, the latter was successfully obtained. The observed ring size-dependent deprotection was interpreted by steric effect.