3a), X = Br (3b), X = COOH Keeping equimolar amounts of (3b) and brucine in ethanol/ methanol (1 : 1-1 : 2 v,'v) for some time gives a 60 % yieldC71 of a crystalline brucine salt that shows rapid mutarotation in acetone at 20.5 O C (ty2 = 200 sec; extrapolation of the specific rotation to to gives [
Valence-Bond Isomers of (Substituted) Benzene
✍ Scribed by Dr. H. G. Viehe; Dipl.-Ing. R. Merényi; Dr. J. F. M. Oth; J. R. Senders; P. Valange
- Publisher
- John Wiley and Sons
- Year
- 1964
- Tongue
- English
- Weight
- 244 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0044-8249
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
Single-zeta and -electron double-zeta basis sets are used to examine some theories of the origin of the stability of the D isomer of O , using ab initio 2 h 4 Ž valence-bond procedures. With these basis sets, resonance between covalent-type i.e., . O и и O valence-bond structures does not lead to a
The electronic structure of the benzene methylene isomers fulvene, dimethylenecyclobutene, and trimethylenecyclopropene is studied using spin-coupled theory. It is shown that the three isomers all possess three noninteracting -bonds and very low resonance energies. This is to be contrasted with benz
## Abstract An approximate __ab‐initio__ valence bond calculation of hydrogen bond energy was carried out and the results are discussed. The total bond energy of a simplified NH…O structure is calculated for various NH and N…O distances and the potential energy profiles are obtained. The hydrogen