Abstract
Image Presented The crowded methylene-functionalized calix[4]arenes 4 and 5 display restricted rotation of the tert-butyl substituents at the bridges. At low temperatures, separate signals were observed for the methyls of these groups in the 1H NMR spectra.
Original language | English |
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Pages (from-to) | 3662-3665 |
Number of pages | 4 |
Journal | Organic Letters |
Volume | 11 |
Issue number | 16 |
DOIs | |
State | Published - 20 Aug 2009 |