Abstract: H-Phosphinates react with alkenes and alkynes using catalytic manganese (II) acetate. Under stoichiometric conditions with manganeseACHTUNGTRENNUNG (III) acetate or with catalytic manganese (II) acetate+ excess manganese (II) oxide various reactions like arylation or cyclization through radical oxidative arylation can take place. Whereas the chemistry of manganese is already well developed for the functionalization ...