Ab initio calculations have been carried out on s-trans-Nvinylmethyleneammonium, pyridinium, and related compounds to obtain rotational barriers, structures, and vibrational frequencies. The restricted Hartree-Fock (RHF) level of theory with 6-31G\*\* basis set was used for these calculations. In ad
A molecular mechanics (MM2) study of Furan, Thiophene, and related compounds
โ Scribed by Julia C. Tai; Jenn-Huei Lii; Norman L. Allinger
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 827 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
โฆ Synopsis
The molecular mechanics calculations reported earlier for nitrogen heterocycles have now been extended to include the title compounds, and related molecules. It is in general possible to calculate these structures with an accuracy that compares favorably with experiment.
๐ SIMILAR VOLUMES
## Abstract Highโlevel __ab initio__ calculations have been performed on __N__โmethylโ__N__โmethyleneammonium and related compounds to obtain accurate rotational barriers, structures, and vibrational frequencies. The 6โ31G\*\* basis set has been utilized at the HartreeโFock level of theory for thes
The syntheses of the thiophenic analogue of Moprolol (Id) and of its related compound l a are described. From a preliminary pharmacological evaluation compound Id seems worthy of further studies due to its notable P-blocking activity and its remarkable anti-platelet aggregation action. ## Synthese
A molecular mechanics force field was developed for systems bearing the N -C -0 unit on the basis of 6-31G\* and 4-21G %b initio" calculations with full optimization of the geometry and experimental heats of formation. The parameters used, which implicitly included the anomeric effect, provided good