p-Toluenesulfonyl hydrazide (TsNHNH2) is a convenient, solid, and inexpensive hydrogen donor.
see also: hydrazine, methylhydrazine
A base-mediated semihydrogenation of ynamides using p-toluenesulfonyl hydrazide as an inexpensive and easy-to-handle hydrogen donor provides the thermodynamically unfavorable Z-enamides exclusively without overhydrogenation and reduction of other functional groups.
Z. Zhao, Q. Tian, Y. Chen, S. Wen, Y. Zhang, G. Cheng, J. Org. Chem., 2021, 86, 10407-10413.