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Conformation and rotational barriers of 2-substituted 1,3-diphenylallyl anions

✍ Scribed by G. Boche; K. Buckl; D. Martens; D.R. Schneider

Publisher
Elsevier Science
Year
1979
Tongue
French
Weight
259 KB
Volume
20
Category
Article
ISSN
0040-4039

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✦ Synopsis

The conformati ons and the rotational barriers of the 2-substituted 1,3-diphenylallylanions lb-g (Tab.2) have been determined. Increasing size of the substituents leads tomore exo,endo-and endo,endo-conformers at the cost of the exo,exo-species. This trend is connected with decreasing AG*-values of the rotational barriers ; the barriers are essentially not affected by ion pair effects, which is in contrast to the parent "ally1 anion". As shown by the rotational barriers of allyllithium and allylpotassium in tetrahydrofuran (THF) (EA=10.5f2kcal/mole ' and AGs(600C) "17 kcal/mole 2,

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Conformational studies of 2-anilino-subs
Conformational studies of 2-anilino-substituted 1,3,2-oxazaphospholanes
✍ William N. Setzer; Mark N. Flair; Xiao-Jing Yang; Chia-Kuei Wu; Edward J. Meehan 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 828 KB

## Abstract A series of 2‐anilino‐2‐thio‐1,3,2‐oxazaphospholanes derived from ephedrine has been synthesized and conformationally studied by proton NMR and X‐ray crystallography. The NMR data can be interpreted in terms of twist‐envelope conformations in which the anilino substituents on phosphorus