Anomalous Steric Effect of a Remote Substituent in a High-Pressure Reaction
β Scribed by Yu. G. Shtyrlin; V. Yu. Fedorenko; E. N. Klimovitskii
- Book ID
- 110312082
- Publisher
- Springer
- Year
- 2001
- Tongue
- English
- Weight
- 23 KB
- Volume
- 71
- Category
- Article
- ISSN
- 1070-3632
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π SIMILAR VOLUMES
## Abstract The ylide generated in situ from planarβchiral pyridinophane (II) exhibits high enantioselectivity in cyclopropanations of 2βsubstituted malononitriles.
The effect of a remote substituent on the regioselectivity in the oxymercuration of unsymmetrical substituted norbornenes has been investigated. Moderate to high levels of regioselectivity were observed with both exo-and endo-substituents at C-2 of norbornenes.
Competitive reactions of dimethyl ether ions are used to probe the steric and substituent effects of substituted phenols and anisoles in a quadrupole ion trap. The relative percentages of protonation and methylene substitution from the reactions of dimethyl ether ions show a correlation with size, l