> The catalytic power within green solid powder makes Rh ₂ (OAc) ₄ an irreplaceable " carbene shuttle" in modern organic synthesis. Rhodium(II) acetate dimer ( Rh ₂ (OAc) ₄， CAS ： 15956-28-2 ) , a classic dirhodium(II) catalyst, occupies a central position in metal carbene chemistry due to its unique axial coordination capability and controlled carbene transfer characteristics. Its molecular structure features two rhodium atoms connected by a metalmetal bond, bridged peripherally by four acetate ligands to form a rigid planar structure. This architecture provides a stable coordination environment for carbene intermediates, endowing it with balanced high reactivity and selectivity — making it the preferred catalyst for key transformations including cyclopropanation, CH insertion, and ylide formation. 01 Core Mechanism of carbene Transfer The essence of Rh ₂ (OAc) ₄ cat...