A useful modification of the attached proton test 13C NMR experiment: Unambiguous peak assignments for carbons with large 1J(CH) values
✍ Scribed by Peggy A. Radel; Stephen B. Kahl
- Book ID
- 104255736
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- French
- Weight
- 185 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
We have developed an extension of the APT 13C NMR experiment which differentiates tetracoordinate methine carbons and hexacoordinate 2-carboranyl carbons in complex organic molecules bearing o-carboranyl functionalities, as well as discriminating between pairs of carbons such as methylenes and terminal alkynes. The differences in the 1J(CH) of each carbon results in modified intensities in APT experiments using a 7.5 msec and a 10 msec delay. Comparing the spectra from these two experiments definitively assigns the peaks to the appropriate carbon, yielding information often only obtainable from 2D experiments.