The work presented in Thomas M. Gøgsig's thesis deals with the discovery of new metal-catalyzed transformations ranging from Kumada-, Heck- and Suzuki-type reactions. The thesis starts with a formidable introduction to Pd-catalyzed cross-coupling reactions. New results have been obtained on: (i) Pd-catalyzed 1,2-migration reactions, (ii) Pd-catalyzed Heck reactions employing heteroaromatic tosylates, (iii) Ni-catalyzed Heck reactions, and (iv) Pd-catalyzed carbonylative Heck reaction.