The cation complexation model performs better than the hydride model and is at par with the transition state model at the HF/6-31G\* and B3LYP/6-31G\* levels. Electrostatic effects that rely on the residual charges on C5 and C6 of the title substrate and that are believed to contribute to the overal
Unexpected effect of an hydroxyl group on π-facial selectivity in the nucleophilic addition to bicyclo[2.2.2]octan-2-ones
✍ Scribed by Jean-François Devaux; Pierre Fraisse; Issam Hanna; Jean-Yves Lallemand
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- French
- Weight
- 250 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0040-4039
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📜 SIMILAR VOLUMES
The remotely substituted 5-exo-bicyclo[2.1.1]hexan-2-one system is introduced as a new probe to study long range electronic effects on p-face selectivity during hydride reduction and a systematic computational study demonstrates good predictability at the semi-empirical level.
Summarv : The transition state structures for addition of LiH to 1, 2, and 3 are computed and analyzed at MP2/6-3lG(d)//HF/6\_3lG(d). Three factors are found to be important for the relative energies of the transition state structures: (i) the conformational energy of the aldehyde; (ii) the interac
## SummarV : The conformational profiles for rotation around the C-C(=O) bond a and the energy minimum conformations are calculated for propionaldehyde 1, chloroacetaldehyde 2, MP2/6-3lG(d)//HF/6\_3lG(d). and 2-chloropropionaldehyde 3 at a function of a for 1, 2, The energy level of the LUMO is ca
6 ]decan-10-ones and endo-tricyclo [5.2.1.0 2,6 ]dec-8-en-10-ones with hetero atom modifications at the distal C-4 position have been subjected to hydride reduction. p-Face selectivities in these systems are largely governed by the same electronic factors that were earlier identified in the case of