## Abstract Aryl Ξ²βchlorovinyl ketones react with the methyl group of 2,6βdiβ__tert__βbutylβ4βmethylpyrylium perchlorate in the presence of pyridine to yield doubly vinylogous 4__H__βpyrones **3**. Only one configuration and conformation from the eight possible structures appears to be present acco
Pyrylium salts from pyrones and some organometallic compounds
β Scribed by S. V. Krivun; A. I. Buryak; S. N. Baranov
- Book ID
- 112330202
- Publisher
- Springer US
- Year
- 1973
- Tongue
- English
- Weight
- 285 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0009-3122
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## Abstract The ^13^C chemical shifts of several alkyl and phenyl substituted pyrylium perchlorates, together with related pyridine and pyridinium salts, are reported. The shifts in the isoelectronic series benzene, pyridine, pyrylium cation correlate well with charge densities calculated by INDO M
Most promising for future exploration are the cocyclizations of the enantiomerically pure nucleoside models 4b-d, bearing what might be considered chiral auxiliary sugar substituents. Their potential utility is demonstrated in the highly diastereoselective construction of 6e. 5) As discussed previo