Spectres de vibrations de pyrimidines tétrasubstituées trichloro-2,4,6 (methylthio)-5 pyrimidine, tétrachloro et tétrabromopyrimidines
✍ Scribed by H. Gauthier; J.M. Lebas
- Book ID
- 113374262
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 694 KB
- Volume
- 35
- Category
- Article
- ISSN
- 1386-1425
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## Abstract Raman and infrared spectra of crystalline1,2,3,4,5‐tetrachloro‐ and tetrabromobenzenes have been analysed between 10 and 100 cm^−1^ over a range of temperature from 10 K to 400 K. An assignment of lattice modes is given. The first‐order phase transition is of a displacive type as shown
Substituted pyridazines, pyrimidines and s-triazines yield very simple N. M. R. spectra. Substituent effects of electron releasing groups are enhanced in these heterocycles, and surprisingly large shifts occur at the meta positions. The JP-5 in 3,6-disubstituted pyridazines vary with the electron re