Everyone. Now let's take a look at the phase 2 mechanism. Here we're going to say each of the intermediates undergoes a cycle of addition, which is 2a, and a cycle of revision, which is 2b, reaction cycle with the alkene. We're going to say one alkene product, and another intermediate is produced in each reaction. So here, if we take a look, we can say that this can react here, and this one can react here.

We're going to say here that this alkene can react here, and this one can react here. And then through our 2+2 cycloaddition, which again makes a cyclobutane product, gives us this ring. And then we can say that this bond here breaks to form here, and this bond here breaks to form here. Giving us, as our alkenes, the cis or z isomer. And then here we'd have our ruthenium here.

Oh, actually, ruthenium is there. And we can also have e or z isomers, so the Rs can be on the same side, or they can be on opposite sides. In this one, this interacts here, and this interacts here, giving us this cyclobutane ring. Again, this bond can break here, and this bond can break here. This will give us just one possible alkene since there's only one R group on this alkene.

This can react here, and this could react here, giving us this structure. This bond here would break here, and this bond would break here, giving us these two. This bond would break here, and this would break here, giving us this structure, and here to here, giving us these possible products. Alright. So this is the way we can set up phase 2 in terms of the mechanisms involved.