This chapter covers the published literature, related to the development of tervalent phosphorus acid derivatives, during the year 2018. A critical selection of bibliographic material was performed, essentially focused on the synthesis of new ligands and metal complexes, new synthetic strategies and applications in catalysis. Several review articles have been published in the field, with particular emphasis on their catalytic applications.^1–8 

Several examples regarding the preparation of aminophosphine metal complexes were reported during the year 2018, as well as their applications, namely as catalysts in hydroformylation reactions,⁹  as synthons in polymerisation reactions¹⁰  and Staudinger reactions,¹¹  as well as catalysts in environmental remediation.¹²