Homogeneously Catalyzed Dimerization of Isoprene to 2,7‐Dimethyl‐2, trans ‐4,6‐octatriene at Chromium

The tail‐to‐tail dimerization of isoprene to give (1) is accomplished in 80% yield on a 1,4‐diaza‐1,3‐diene‐modified chromium(0) catalyst. The absence of other isoprene suggests strong steric interaction during the first CC linkage.