The monocondensation product 2, which, in the case of the tert-butyl derivative could be detected 3'P-NMR-spectroscopically in the reaction solution at -90Β°C'21, cannot be observed during the synthesis of 3, apparently because of the drastic reaction conditions[51.
Generation of the Tetraphenylcyclobutadiene Radical Cation by Ionizing Gas-Phase Decarbonylation
β Scribed by Wolfgang Blum; Prof. Dr. Harry Kurreck; Dr. Wilhelm J. Richter; Prof. Dr. Helmut Schwarz; Helga Thies
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 210 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0044-8249
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π SIMILAR VOLUMES
Nucleobase-derived radicals are crucial transient intermediates in the radiation damage of nucleic acids (RNA and DNA). Among the recognized mechanisms of radiation damage, capture of a low-energy electron followed by protonation of the transient anion radical results in the formation of hydrogen-at
200 mL) was acidified with 3 drops of 32% HCI and stirred for 15 min at 50Β°C (exclusion of light). After extraction with CH,CI,, the organic phase was dried (Na,SO,) and purified on silica gel (20 8). After removal of the solvent there remained 0.53 g (72%) of a crystalline product. For further puri