Thiols added easily to acetylenic compounds in the presence of Et3B to give alkenyl sulfides in good yields. The reaction of acetylenes with 3-methyl-2-buten-1-thio1 gave dihydro-thiophene derivatives in one pot.
In the reactions with enolate anions, organoselenium moieties of aryl vinyl selenoxides and selenones have exhibited two important roles, e.g., activation of C=C bonds for conjugate addition reaction and behaviors as excellent leaving groups. Owing to such characteristic features, ketone enolates react with p-chlorophenyl vinyl selenoxide to afford the corresponding cyclopropyl ketones through an initial
Vinylic chalcogenides were synthesized stereospecifically by hydrochalcogenation of propargylic amines or alcohols mediated by cerium(III) chloride. The products were obtained in good yields and with high regio- and stereoselectivities. cerium chloride - vinylic chalcogenides - hydrochalcogenation - selenium - tellurium
Dependence of catalytic activity of metal-containing particles on degree of ordering rather than on size and shape. Pd and Ni-catalyzed carbon–heteroatom bond formation
作者:Igor V. Chistyakov、Valentine P. Ananikov
DOI:10.1016/j.mencom.2013.11.011
日期:2013.11
High selectivity and good yields in the catalytic addition of thiols and selenols to alkynes were observed for Ni and Pd chalcogenide catalyst particles with high degree of ordering, whereas direct correlation with size and shape of the particles was not identified.