Protonenresonanz-Spektroskopie ungesättigter Ringsysteme—XVI 7,7-Difluor-benzo-cyclopropen

✍ Scribed by Harald Günther; Josef Bernd Pawliczek

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 652 KB
• Volume: 3
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1270030302

✦ Synopsis

The NMR-spectrum of 7.7-difluoro-benzo-cyclopropene (2) has been analysed to obtain chemical shifts and spin, spin-coupling constants: 6AAj = 7.6026, tiBB, = 7.4834 ppm; JAB = 6.86, J A a , = 7.45, J A ~, = 0.34 and JBB. = 1.89 Hz. Heteronuclear double resonance experiments have been used to establish a positive sign for 4J(H-F) (3.64 Hz) and a negative sign for 5J(H-F) (-0.33 Hz) in this molecule. The results are discussed with reference to the structure of 2 and the NMR data found for benzo-cyclopropene.

Zusammenfassung-Das NMR-Spektrum voii 7,7-Difluor-benzo-c~clopro~en (2) wurde zur Bestiminung der chemischen Verschiebungen und Spin, Spin-Kopplungskonstanten analysiert: