期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 72, 期 7, 页码 2302-2308出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo061989w
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资金
- Engineering and Physical Sciences Research Council [GR/S57785/01] Funding Source: researchfish
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. H-1 NMR studies indicate that the stacked conformation persists in solution.
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