Conformation of sterically hindered 4-nitropiperidines
β Scribed by L. A. Myshkina
- Book ID
- 112444754
- Publisher
- Springer
- Year
- 1983
- Tongue
- English
- Weight
- 337 KB
- Volume
- 32
- Category
- Article
- ISSN
- 1573-9171
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π SIMILAR VOLUMES
## Abstract The temperature dependent spectra of several monoβ, diβ and trialkylthioureas have been recorded. Free energy barriers to internal rotation about the Cο£ΏN bonds have been calculated. In thioureas that were unsymmetrically substituted, free energy barriers were found to be different for e
The photoisomerization yields of a homologous series of o,o,o',o'substituted azobenzenes have been determined by excitation of the low lying l(n,~\*) and the higher lying I(~F,~F\*) states. For more severe steric hindrance, i.e. with substituents more bulky than methyl, the E + 2 quantum yields are