(η⁵ -Cyclopentadienyl)[N,N-dimethyl-Ν′-(2-pyridinylmethylidene)propane-1,3-diamine]ruthenium hexafluorophosphate

(η⁵ -Cyclopentadienyl)[N,N-dimethyl-N′-(2-pyridinylmethylidene)propane-1,3-diamine]ruthenium hexafluorophosphate is also referred to as Herzon reductive hydration catalyst. Herzon reductive hydration catalyst is a half-sandwich ruthenium complex. It is a tridentate nitrogen-based ligand containing a hemilabile 3-(dimethylamino)propyl group. It participates in the conversion of terminal alkynes to linear alcohols.

Catalyst mediates the transformation of alkynes to alcohols through an anti-Markovnikov addition. This reaction occurs at room temperature with the use of formic acid to assist in the reduction of the intermediate aldehyde to the corresponding alcohol.