Abstract
The addition of substituted anilines to nitro-substituted isocyanates followed by reduction generates new aniline-substituted ureas, which can be further extended in a one- or two-directional iterative manner to form oligomeric ureas based on a m-phenylenediamine monomer. Oligo-ureas with up to eight urea linkages are reported. Fully N-substituted oligo-ureas are crystalline, and the X-ray crystal structures display ring-stacked conformations. 1H NMR studies indicate that the stacked conformation persists in solution.
Original language | English |
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Pages (from-to) | 2302-2308 |
Number of pages | 7 |
Journal | Journal of Organic Chemistry |
Volume | 72 |
Issue number | 7 |
Early online date | 8 Mar 2007 |
DOIs | |
Publication status | Published - 30 Mar 2007 |