Ab initio calculations at both the Hartree-Fock and M~ller-Plesset (MP2) levels of theory utilizing various basis sets were carried out on propargyl alcohol and its derivatives. The results of these calculations were used in conjunction with available experimental data in the formulation of an MM3 f
Ab initio and molecular mechanics (MM3) calculations on alkyl- and arylboronic acids
โ Scribed by Xiannong Chen; Guyan Liang; David Whitmire; J. Phillip Bowen
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 110 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0894-3230
No coin nor oath required. For personal study only.
โฆ Synopsis
The boronic acid functional group has been incorporated into various biologically important compounds. In order to study this class of compounds better with molecular mechanics, five alkyl-and arylboronic acids were calculated using ab initio methods (Spartan) at the RHF/6-31G * level. MM3 force field parameters were developed based on the theoretically calculated geometries, vibrational spectra, and torsional profiles.
๐ SIMILAR VOLUMES
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
The MM3 force field has been extended to include the nitriles and alkynes. Structures, heats of formation, dipole moments and conformational equilibria for aliphatic nitriles and alkynes compounds are fitted to within experimental error. The vibrational spectra for aliphatic nitriles and alkynes wer
The geometries and vibrational frequencies of 11 training molecules containing the ammonium ion moiety were calculated at the MP2r6-31qG U level of theory. Various torsional energy profiles were also calculated using this basis set. From those ab initio calculations, a molecular mechanics ลฝ . MM3 fo
## Abstract The MM3 force field has been extended to deal with the lithium amide molecules that are widely used as efficient catalysts for stereoselective asymmetric synthesis. The MM3 force field parameters have been determined on the basis of the __ab initio__ MP2/6โ31G\* and/or DFT (B3LYP/6โ31G\