1. J. F. Hartwig , Organotransition metal chemistry: from bonding to catalysis , University Science Books , 2010
2. We would like to note that examples for transition metal-free selective SH of alkynes are known, however, these will not be discussed in this review
3. Selected overviews: W.Bonrath , J. A.Medlock and M.-A.Müller , Catalytic Reduction of Alkynes and Allenes, in Catalytic Reduction in Organic Synthesis 1, 2018 , ed. J. G. de Vries , Georg Thieme Verlag , Stuttgart , 2018
4. Advances in chemoselective and/or stereoselective semihydrogenation of alkynes
5. Are Alkyne Reductions Chemo-, Regio-, and Stereoselective Enough To Provide Pure (Z)-Olefins in Polyfunctionalized Bioactive Molecules?