... Todd B. Marder , Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg ... Fernández and co-workers proposed that an sp 2 –sp 3 adduct of 1, formed ... K(18-crown-6)(thf) 2 ] + as the counterion, was isolated as the sole product. ...