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The Negishi cross‐coupling reactions involves the application of organozinc reagents and is a highly versatile reaction in synthetic organic chemistry. The transmetallation step plays a pivotal role in the mechanism of these types of cross‐coupling reactions. In this study, mechanistic investigations are presented indicating that higher‐order zincates are the transmetallating active species in Pd‐...
We report an unexpected rearrangement, controlled by the nature of the bridge, leading to the formation of novel, remarkably stable triply fused dinickel(II)/dicopper(II) chlorin‐porphyrin dication diradical heterodimers in excellent yields. Here, a dipyrromethene bridge gets completely fused between two porphyrin macrocycles with two new C−C and one C−N bonds. The two macrocycles exhibit extensive...