The NMR spectra of ortho, meta, and para dicyano benzene in a nematic solvent
β Scribed by W. de Kieviet; C.A. de Lange
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 205 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
Proton NMR spectra of the dicyano benzenes, dissolved in a nematic liquid crystal, have been measured and analysed. Ratios of interproton distances have been determined in each case. Accurate values for the indirect couplings and chemical shifts of ortho and meta dicyano benzene have been obtained in acetone.
π SIMILAR VOLUMES
New examples of the ortho effect in bisphenol A derivatives including interaction of the hydrogen of the orthohydroxy group with the neighbouring aromatic ring have been observed. The characteristic ions [ M -PhOH j +. (m/z = 134) and [ M -CH, -PhOHj + (m/z = 119) were shown to form through the hydr
## Abstract Chemical shifts for tritons in __ortho__, __meta__ and __para__ positions in toluene have been determined using a 64 MHz tritium NMR spectrometer. The order of shift is __meta__>__para__>__ortho__, whereas the calculated shift order for protons is __meta__>__ortho__>__para__.
## 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 esterif