| Autor: |
Chen, Qingqi, Cheng, Lingjiang, Wang, Changqi, Jin, Shen |
| Zdroj: |
Spectroscopy Letters; March 1995, Vol. 28 Issue: 2 p223-230, 8p |
| Abstrakt: |
Symmetric dipyrrylmethanes were prepared by converting ethyl 5-methylpyrrole-2-carboxylates into corresponding 5-methyl substituted pyrroles oxidized by bromine, and then self-condensed without separation and purification. The N-H H NMR analysis and molecular conformation computation revealed that strong intramolecular hydrogen bondings exist in dipyrrylmethane 2b and 2e (3,3' substituents are formate and acetate esters), while very weak or no intramolecular hydrogen bonding exist in other dipyrrylmethanes. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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