Fluorinations of ?-Seleno Carboxylic Acid Derivatives with Hypervalent (Difluoroiodo)toluene
作者:Maria A. Arrica、Thomas Wirth
DOI:10.1002/ejoc.200400659
日期:2005.1
A very efficient synthesis of (difluoroiodo)toluene avoiding the use of elemental chlorine and elemental fluorine is described. We have fluorinated a series of α-acceptor substituted selenides using (difluoroiodo)toluene.The reactions are usually very clean and under the reaction conditions no further oxidized products are observed.
S<sub>H<sup>2</sup></sub>REACTIONS OF SELENOSULFIDES WITH CARBON RADICALS
作者:Masato Yoshida、Toshitsura Cho、Michio Kobayashi
DOI:10.1246/cl.1984.1109
日期:1984.7.5
o-Nitrophenyl phenylselenyl sulfide suffered SH2 attack by carbon radicals on selenium atom to give selenide and thiyl radical; the relative rate constant of the selenosulfide with phenyl radical was compared with those of the other selenium compounds.
Radical-Triggered Three-Component Coupling Reaction of Alkenylboronates, α-Halocarbonyl Compounds, and Organolithium Reagents: The Inverse Ylid Mechanism
作者:Nicholas D. C. Tappin、Manuel Gnägi-Lux、Philippe Renaud
DOI:10.1002/chem.201802384
日期:2018.8.6
An operationally simple protocol to affect a radical addition to alkenylboronates that spontaneously undergo a [1,2]‐metalate shift is described. Overall, the reaction is a three‐component coupling of an organolithium, alkenylboronic ester, and halide which takes place with broad scope and good to excellent yields. Experimental mechanistic investigations support the formation of a boron inverse ylid
dimethylhydrazones 1 (R2=H) and derived from linear aliphatic aldehydes, has led to α-phenylselanyl hydrazones 2. α-Phenylselanyl nitriles 3 were, however, isolated when an excess of base and of PhSeX (X=Cl, Br) were used. Hydrazones 1 bearing an α-alkyl substituent (R2≠H) gave also nitriles 3. SAMP-hydrazones 4 showed the same reactivity and the corresponding nitriles 3 were obtained in a racemic form. The use of