Dissociative ionization of aryl-substituted vinyl bromides in the gas phase: experimental and computational evidence for the formation of stable .alpha.-arylvinyl cations both by direct means and by spontaneous exothermic isomerization of unstable isomeric ions
Transition-Metal-Free Iodine Catalyzed Selenocayanation of Styrenyl Bromides and an Easy Access to Benzoselenophenes via Intermediacy of Styrenyl Selenocyanate
作者:Pintu Maity、Bidisha Paroi、Brindaban C. Ranu
DOI:10.1021/acs.orglett.7b02571
日期:2017.11.3
convenient procedure has been developed for the synthesis of styrenyl selenocyanates and benzoselenophenes from readily available styrenyl bromides by reaction with potassium selenocyanate in the presence of iodine under specified conditions. A series of both compounds have been obtained by this procedure. The synthesis of styrenyl selenocyanates has not been previously reported, and thus this method is of
Chromium-catalyzed olefination of arylaldehydes with haloforms assisted by 2,3,5,6-tetramethyl-<i>N</i>,<i>N</i>′-bis(trimethylsilyl)-1,4-dihydropyrazine
作者:Kohei Nishi、Hayato Tsurugi、Kazushi Mashima
DOI:10.1039/d2cc06104j
日期:——
Chromium-catalyzed olefination of arylaldehydes with haloforms was achieved using 2,3,5,6-tetramethyl-N,N′-bis(trimethylsilyl)-1,4-dihydropyrazine (1a) as an organic reducing agent, giving β-halostyrene derivatives in a trans-selective manner. The reaction required no metal powders, such as zinc and manganese, as reductants, thereby minimizing metal-based reaction waste.