Z-selective hydrosilylation of terminal alkynes catalyzed by a bench-stable manganese alkyl complex.

UNLABELLED: A stereo- and regioselective Mn(I)-catalyzed hydrosilylation of terminal alkynes is described. The hydrosilylation reaction selectively yields the thermodynamically less stable (Z)-alkenyl silane. A wide variety of aromatic and aliphatic alkynes were efficiently and selectively hydrosilylated. The reactions proceed with catalyst loadings of 1-2 mol% at 60 °C in THF without the need of any additives. The active precatalyst is the bench-stable alkyl Mn(I) complex fac-[Mn(PC-iPr)(CO)3(CH2CH2CH3)]. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at https://doi.org/10.1007/s00706-026-03510-0.