Mechanistic study of the addition reaction of 'TE''CL IND. 4' to alkynes: participation of 'TE''CL IND. 3' centered-radical - Keppler, Artur Franz; Prado, Fernanda Manso; Cerchiaro, Giselle; Di Mascio, Paolo; Comasseto, João Valdir (Journal of Organometallic Chemistry, 2008)