Living on Acetylene. A Primordial Energy Source - The Metal-Driven Biogeochemistry of Gaseous Compounds in the Environment - page 29

Figure 6 Pathways of several reaction mechanisms proposed for AH. (a) Nucleophilic attack of the activated water ligand of the W ion [ 21 ](b) First shell
mechanism involving a η

2 -acetylene complex followed by a nucleophilic attack of a water molecule [ 34 ]. (c) First shell mechanism with a tungsten vinylidene
complex as intermediate [ 37 ]. (d) Mechanism with a η

2 -acetylene complex followed by several proton transfers to and from Asp13 [ 35 ]. Data adapted from

[ 34 , 35 , 37 ].