期刊
TETRAHEDRON
卷 59, 期 29, 页码 5539-5544出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(03)00808-1
关键词
calixarenes; selective upper rim functionalization; formylation reaction; proximal functionalization; dialcohols; diacids; NMR spectroscopy
The synthesis and isolation of elusive tetralkoxycalix[4]arenes 2 in the cone conformation and bearing two formyl groups in proximal (1.2) positions at the upper rim are described for the first time. They were obtained as a mixture with the distal (1,3) regioisomers 3 by optimizing the Gross formylation reaction on the tetralkoxycalix[4]arenes 1. After reduction to the corresponding alcohols, compounds 4 could be isolated and oxidized to 1,2-diformyl (2) and 1,2-diacid (6) tetralkoxycalix[4]arenes. These 1,2-difunctionalized derivatives are useful intermediates for the synthesis of calixarene-based molecular receptors having proximal binding groups. (C) 2003 Elsevier Science Ltd. All rights reserved.
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