Polborn, Kurt and Schmidpeter, Alfred and Maerkl, Gottfried and Willhalm, Angela (1999) 1,2,4-diazaphospholes and 1,2,4-diazaarsoles: Ring structure and structure of hydrogen-bonded pairs and helices. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 54 (2). pp. 187-192. ISSN 0932-0776,
Full text not available from this repository.Abstract
Among the large family of azaphospholes 1,2,4-diazaphospholes feature a particularly stable ring system. 3,5-Unsubstituted and 3,5-equally substituted 1,2,4-diazaphospholes and -diazaarsoles are best made from 1,3-bis(dimethylamino)-2-phospha/arsaallyl chlorides and hydrazines. This way four examples for single crystal X-ray structure investigations were prepared: The unsubstituted 1,2,4-diazaphosphole 2 and -diazaarsole 4, the N-substituted 1-(2-pyridyl) 1,2,4-diazaphosphole 1, and the C-substituted 3,5-di-tert-butyl 1,2,4-diazaphosphole 3. They all possess planar rings with small angles at P (86 degrees) and As (81 degrees). The N-unsubstituted molecules are connected to each other by NH ... N hydrogen bonds forming in case of the isotypic compounds 2 and 4 a helix along a crystallographic axis and in case of compound 3 for steric reasons a dimer. The structures of the aggregates found are compared to those of pyrazoles.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SOLID-STATE; phosphaarenes; arsaarenes; hydrogen bonds; pyrazoles |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Nov 2022 14:47 |
| Last Modified: | 22 Nov 2022 14:47 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48576 |
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