## Abstract Measurement of the ^13^C NMR spectra of the bridgehead nitro compounds __1a–5a__ has been performed. It is found that one‐bond ^13^C^15^N coupling is not necessarily a reflection of the degree of s character of the bridgehead carbon exocyclic bonding orbital. Although the magnitude of
13C chemical shifts and 1H-13C coupling constants of N-phenyl-, N-p-fluorophenyl- and N-o-nitrophenylpyrazoles
✍ Scribed by Mikael Begtrup; Per Vedsø; Pilar Cabildo; Rosa Maria Claramunt; Jose Elguero; Wim Meutermans
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 264 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The ^13^C chemical shifts and some ^1^H^13^C coupling constants of twelve N‐arylpyrazoles are reported. The assignments were made by using the effects of a fluorine substituent and two‐dimensional techniques.
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The 1 H and 13 C NMR resonances of 15 N,N -diacylproflavines were assigned completely and unequivocally using a concerted application of one-and two-dimensional experiments (DEPT, gs-COSY, gs-HMQC and gs-HMBC).
## Abstract On protonation of 3,4‐dihydroisoquinoline‐^15^N ^1^__J__(^13^C—1, ^15^N) is increased by a factor of five and ^1^__J__(^13^C—3, ^15^N) changes its sign, while on protonation of 3,4‐dihydroisoquinoline‐^15^N‐oxide the coupling constants, including the relatively large ^1^__J__(^13^C—1, ^
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## Reference Data 13C NMR Chemical Shifts of N u nsubstituted-and N-MethyI-Pyramle Derivatives 13C shielding data for 100 derivatives of pyrazole are reported. These include methyl, ethyl, n-propyl, tert-butyl, phenyl, hydroxymethyl, carboxyl, ethoxycarbonyl, cyano. amino, hydrazino, nitro, azido,