Journal
TETRAHEDRON
Volume 65, Issue 1, Pages 300-304Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2008.10.083
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Funding
- Shanghai Commission for Science and Technology [06Pj14034, 06DZ19002]
- Ministry of Education [106078]
- Ministry of Science and Technology of China (973 Project [2003CB716600]
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ortho-Linked oxacalix[n]arene[n]hetarenes (n=2, 3) were prepared by one-step cyclooligomerization of catechol and meta-dichlorinated nitrogen containing heterocycles or via a two-step reaction process. Solid state structure of the ortho-linked oxacalix[n]arene[n]hetarenes (n=2, 3) has been determined by X-ray crystallography. 1,3-Alternate and 1,3,5-alternate conformations were found for ortho-linked oxacalix[2]arene[2]pyrazine (1) and oxacalix[3]arene[3]pyrazine (2), respectively. However, a core conformation with C-3 symmetry was found for ortho-linked oxacalix[3]arene[3]pyrimidine (4), which is completely different from that of its isomer, compound 2. (C) 2008 Elsevier Ltd. All rights reserved.
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