Macroscopically, reaction rates can be of varied order. But mechanistically, most reactions are first-order or second-order/binary (e.g. SN2, many catalyst surface reactions, dimers). Most processes that are macroscopically ternary (e.g. protein synthesis) involve the formation of an intermediate (e.g. translation complex).
Are there any true elementary ternary reactions, involving the chance collision of 3 substrates?
Note: for this purpose, intermediate dimers are not ternary. I'm asking if there is any known reaction with a genuine ternary transition state, only stabilized by or requiring the 3 species.