title: Stereoselective synthesis of enynes by nickel-catalyzed cross-coupling of divinylic chalcogenides with alkynes.
abstract: (Z,Z)- and (E,E)-divinylic selenides and telurides undergo direct coupling with terminal alkynes in the presence of a nickel/CuI catalyst at room temperature to give (Z)- and (E)-enyne systems in good yields and with complete retention of configuration.
authors.affiliation: Departamento de Química, Universidade Federal de Santa Maria, C. P. 5001, CEP 97105-900, RS, Brazil. silveira@quimica.ufsm.br
authors.forename: Claudio C
authors.initials: CC
authors.lastname: Silveira
authors.forename: Antonio L
authors.initials: AL
authors.lastname: Braga
authors.forename: Adriano S
authors.initials: AS
authors.lastname: Vieira
authors.forename: Gilson
authors.initials: G
authors.lastname: Zeni