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The tungsten(IV) complex (Et 4 N) 2 [W(O)(mnt) 2 ] ( 1 ; mnt = maleonitriledithiolate) was proposed (Sarkar et al., J. Am. Chem. Soc.  1997 , 119 , 4315) to be a functional analogue of the active center of the enzyme acetylene hydratase from Pelobacter acetylenicus , which hydrates acetylene (ethyne; 2 ) to acetaldehyde (ethanal; 3 ). In the absence of a satisfactory mechanistic proposal for the hydration reaction, we considered the possibility of a metal-vinylidene type activation mode, as it is well established for ruthenium-based alkyne hydration catalysts with anti-Markovnikov regioselectivity. To validate the hypothesis, the regioselectivity of tungsten-catalyzed alkyne hydration of a terminal, higher alkyne had to be determined. However, complex 1 was not a competent catalyst for the hydration of 1-octyne under the conditions tested. Furthermore, we could not observe the earlier reported hydration activity of complex 1 towards acetylene. A critical assessment of, and a possible explanation for the earlier reported results are offered. The title question is answered with "no".

Is the tungsten(IV) complex (NEt4)2[WO(mnt)2] a functional analogue of acetylene hydratase?

Is the tungsten(IV) complex (NEt₄)₂[WO(mnt)₂] a functional analogue of acetylene hydratase?