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EnglishThe first examples of dioxamethylene bridged calix[8]arenes 2-6 have been obtained by Cs2CO3-promoted direct O-alkylation of p-tert-butylcalix[8]arene with BrCH2Cl. Assignment of the 1,2-, 1,2:3,4-, 1,2:3,4:6,7-, 1,4:2,3:5,6:7,8-, and 1,2:3,4:5,6:7,8-bridging pattern of 2-6, respectively, was mainly based on chemical shift of OH groups and chemical correlations. Dynamic H-1 NMR studies and MM3 calculations indicated that in these compounds the dioxocine subunit adopts a boat-chair conformation
http://hdl.handle.net/11386/1058636| Titolo: | Dioxamethylene intramolecular bridging of p-tert-butylcalix[8]arene |
| Autori interni: | TROISI, FRANCESCO GAETA, CARMINE NERI, Placido |
| Data di pubblicazione: | 2005 |
| Rivista: | TETRAHEDRON LETTERS |
| Abstract: | The first examples of dioxamethylene bridged calix[8]arenes 2-6 have been obtained by Cs2CO3-promoted direct O-alkylation of p-tert-butylcalix[8]arene with BrCH2Cl. Assignment of the 1,2-, 1,2:3,4-, 1,2:3,4:6,7-, 1,4:2,3:5,6:7,8-, and 1,2:3,4:5,6:7,8-bridging pattern of 2-6, respectively, was mainly based on chemical shift of OH groups and chemical correlations. Dynamic H-1 NMR studies and MM3 calculations indicated that in these compounds the dioxocine subunit adopts a boat-chair conformation |
| Handle: | http://hdl.handle.net/11386/1058636 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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