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No abstract

The Front Cover illustrates a dual catalyst system that minimizes the activation energy to enable new synthetic transformations. Here, a gentleman attempts to pick fruits from a tree; however, his height with a box (representing Rh (II)) is insufficient to reach the fruit. Beside him, a woman attempts to pick fruit – but alas, this box (catalyst II) is also inadequate! Only the lady using both boxes can reach the fruit, indicating the need for a dual catalytic system. More information can be found in the Review by I. Sharma et al.

Dual catalysis represents an alternative archetype in carbene chemistry that surpasses traditional single catalyst systems. By employing dual catalyst systems, one can improve the efficiency of existing reactions and enable new chemical transformations. Reactions involving dual synergistic catalysis are increasingly valuable as they offer convenient strategies for synthesizing challenging quaternary carbon centers and bioactive core structures. This review article focuses on trapping diazo-derived, rhodium (II) zwitterionic intermediates with varying electrophiles such as Michael acceptors, alkynes, π-allyl Pd(II) complexes, and the Nicholas intermediate.