Manganese complexes emerged as potent carbonyl (de)hydrogenation catalysts in the last decade together with other two base metals: Fe and Co. The generation of Mn hydride species has been widely accepted as a prerequisite for the (de)hydrogenation cycle. However, the hydride transfer to non-polar olefins remains uncommon for Mn homogeneous catalysis. Recently a few cases of alkene hydrogenations have been reported with Mn non-pincer complexes. In particular, the alkyl bisphosphine Mn (Ⅰ) catalyst reported by Kirchner group forms active 16e Mn hydride under H 2 atmosphere that can reduce a range of mono-and disubstituted alkenes to alkanes. 17a