Synthetic Route to Phenyl Diazenes and Pyridazinium Salts from Phenylazosulfonates
作者:Susanne Gradl、Johannes Köckenberger、Janina Oppl、Martin Schiller、Markus R. Heinrich
DOI:10.1021/acs.joc.1c00013
日期:2021.5.7
synthesis of pyridazinium salts was achieved from readily available phenylazosulfonates in a single reaction step. The reaction proceeds via the formation of short-lived phenyldiazenes, which—owing to the strongly acidic conditions—are partially protonated. The phenyldiazenes then undergo a rapid cycloaddition to furans to give pyridazinium salts via elimination of water. The fact that the pyridazinium synthesis
In their photochemicaldecomposition, azocompounds of the type PhNNSO3Na trap radicals R' and form RPhN-·NSO3Na, whom R' is NaSO3′ in water at 275 K and *H' in C2H5O*H at 320 K. The ESR parameters of the radicals observed are reported end the mechanism of their formation is discussed.
Splitting constants and g values are reported for 5,5‐dimethylpyrrolidine 1‐oxide spin adducts with radicals such as substituted‐Ph˙, NaSO3˙, PhS2˙, and others observed in the photochemicaldecomposition of azocompounds in various solvents.
报告了 5,5-二甲基吡咯烷 1-氧化物自旋加合物的分裂常数和 g 值,该加合物具有取代的 Ph·、NaSO3·、PhS2· 等自由基,这些自由基在偶氮化合物在各种溶剂中的光化学分解中观察到。
New Procedure for Obtaining Indomethacin
作者:I. V. Magedov、S. A. Maklakov、Yu. I. Smushkevich
DOI:10.1007/s10593-005-0169-5
日期:2005.4
Practical Fischer Indolization Using Bench-Stable Arylhydrazine Sulfonate as the Surrogate of Arylhydrazine
作者:Yanping Zhu、Kaiwu Dong、Wenjuan Li、Chaoren Shen
DOI:10.1055/s-0043-1763622
日期:——
Fischer indolization using bench-stable sodium arylhydrazine sulfonate as a surrogate of arylhydrazine was developed. The preparation of arylhydrazine sulfonate was also modified by replacing sodium sulfite reductant with Pd-catalyzed hydrogen transfer. The straightforward synthesis of tetrahydrocarbazoles from the corresponding anilines was successfully conducted in a one-pot manner. A practical application