Preparation and properties of annelated tropylium salts
โ Scribed by Thummel, Randolph P.; Chayangkoon, Paochai
- Book ID
- 126003964
- Publisher
- American Chemical Society
- Year
- 1983
- Tongue
- English
- Weight
- 781 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0022-3263
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
Quaternization of alkynyl substituted pyrazines with triethyloxonium tetrafluoroborate in dichloromethane occurs exclusively at N-4 yielding 3-alkynyl-lethylpyrazinium salts, as shown by the 13C NMR data. Protonation of the same pyrazines with trifluoroacetic acid also occurs at N-4. The quaternary
Heteropoly compounds are receiving increasing interest as environmentally compatible solid acid catalysts. Partial Cs + exchange into 12tungstophosphoric acid converts the water soluble, low surface area ( < 5 m: g-' ) parent acid into submicron water-insoluble Brcnsted acids with surface areas exce