✦ LIBER ✦
Inconsistent Solvent Shifts Caused by benzene in the NMR spectra of N-alkyl(thio)phosphonothioamides
✍ Scribed by Zeev Tashma
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 250 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Replacement of chloroform by benzene
as an NMR solvent for a series of (thio)phosphonothioamides results in an exceptionally wide range of shifts for the N-CH proton signals, from an upfield shift of approximately 1 ppm to a downfield shift of about 0.1 ppm, depending on the phosphonate esterifying groups, the type of the N-akyl moiety and whether it is a P==O or a P==S compound. The last factor is believed to operate indirectly by decting the aggregation state of the compounds in benzene. * N-Alkyl(thio)carbamoylphosphonic Acid Esters, Part 4. For Part 3, see Ref. 1. a The centre of the multiplet.