The title compounds (2 and 4) obtained by the diastereoselective hydrogenation of the corresponding 1,2,3,6-tetrahydrophosphinine oxides (1 and 3) were subjected to a detailed quantum chemical study. The possible chair conformers were calculated at the HF/6-31G \* level of theory, according to which
A STO-3G study of the geometry and stability of the cross-conjugated polyenes, 3-methylene-1,4-pentadiene, 3,6-dimethylene-1,4-cyclohexadiene and trimethylenecyclopropane
✍ Scribed by Allan Banks; Gilbert J. Mains; Charles W. Bock; Mendel Trachtman; Philip George
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 402 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0022-2860
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## Abstract magnified image The synthetic utility of 1,3‐dipolar cycloaddition of DMAD to sydnones has been exploited in the preparation of new 1‐aryl‐4,5‐dihydro‐1__H__‐pyrazolo[3,4‐__d__]pyridazine‐3,6‐diones **7a‐j** and their aromatic 3,6‐dichloro analogues **8a‐j**. The lactam‐lactim tautomer