“…A number of transition metal complexes have been used as effective catalysts to generate reactive metallacarbenes starting from α-diazocarbonyl compounds [9,10,11,12,13,14,15,16]. Among them, rhodium(II) [17,18], copper(I) [19,20], and more recently ruthenium(II) catalysts [21,22,23,24,25,26,27] have been proven to be especially useful for the development of highly selective carbene C–H insertion methodologies via a variety of reaction modes. Interestingly, palladium, one of the most commonly employed metals in homogeneous catalysis, remains underexploited in this type of carbene C–H insertion processes.…”