X-ray crystal structures of the enolate of tert-butyl α-cyanoacetate with Li+ or protonated 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU-H+) as gegenion. N-H hydrogen bridge from DBU-H+ to the enolate oxygen atom
In: Chemische Berichte, Jg. 127 (1994), Heft 10, S. 2059-2064
academicJournal
- print, 22 ref
Zugriff:
For the first time a solid-state structure with protonated 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU-H+) as the gegenion of an «organic» anion, namely tert-butyl α-cyanoacetate (2-), is determined. The DBU-H+ N-H bond forms a hydrogen bridge to the enolate oxygen atom of 2-, the first N-H bridge to an enolate oxygen atom ever characterized. The structure of 2- DBU-H+ is compared with that of the corresponding lithium compound [2- Li+.TMEDA], in which the cations are bound to the N atoms of the cyano groups and the enolate O atoms forming a twelve-membered ring.
Titel: |
X-ray crystal structures of the enolate of tert-butyl α-cyanoacetate with Li+ or protonated 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU-H+) as gegenion. N-H hydrogen bridge from DBU-H+ to the enolate oxygen atom
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Autor/in / Beteiligte Person: | BOCHE, G ; LANGLOTZ, I ; MARSCH, M ; HARMS, K |
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Zeitschrift: | Chemische Berichte, Jg. 127 (1994), Heft 10, S. 2059-2064 |
Veröffentlichung: | Basel; Cambridge; Weinheim: VCH, 1994 |
Medientyp: | academicJournal |
Umfang: | print, 22 ref |
ISSN: | 0009-2940 (print) |
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