## Abstract The synthesis of six 1‐X‐ (X = OH, OCH~3~, OCOCH~3~, CH~3~, CHO and CN) phenanthrene derivatives with a ^13^C label at C‐1 is described. An analysis of the ^13^C^13^C spin coupling constants shows the importance of π‐interaction for the coupling constant transmission. Small ^13^C^13^C s
13C13C spin coupling constants in tetrahydronaphthylene, hexahydrobenzanthracene and benzo[a]pyrene derivatives
✍ Scribed by Richard H. Cox; Louis A. Levy
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 387 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-1581
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## Abstract Long range inter‐ring ^13^C^13^C couplings are found to be effective in the title compounds, and the magnitudes of coupling constants and of substituent effects on ^13^C chemical shifts, as well as the signs of the latter, alternate with respect to the number of connecting bonds.
## Abstract The synthesis of benzo[a]pyrene‐6‐^13^C is described. Perinaphthane was converted to 6‐benzoyl‐carbonyl‐^13^C‐perinaphthane which was cyclized to 2,3‐dihydrobenzo[a]pyren‐6(1H)‐one‐6‐^13^C. Subsequent reduction of the ketone followed by dehydration and dehydrogenation gave benzo[a]pyren
## Abstract The ^13^C^13^C spin–spin coupling constants in natural abundance oxetane, thietane, cyclobutanone, bromo‐and chlorocyclobutane have been measured. Furthermore, the ^13^C isotope‐induced changes in the chemical shifts of the different ^13^C nuclei in the molecules mentioned above are re
## Carbon -13 chemical shifts and J(PC) coupling constants of 29 vinyl phosphate derivatives are presented. In the series of compounds (RIO)zP(0)OC'(R~)=CzX, (where 3 R: indicates the first carbon of the Rz substituent) large differences were found between the 3J(P, 0, C-1, C-3) and 3J(P, 0, C-1,