 So let's not synthesize the viting reagent. So first thing you're going to need is triphenylphosphine. And then you're going to react this with methyl iodide. And then when you do that, so this is a two-step process. You're going to react that with methyl iodide. And then you're going to react that product with n-butyl lithium water. So let's go over the mechanism of this. So the methyl iodide is just the typical SN2 reaction that you guys know and love, especially Eric and Billy. So when you make that, so phosphorus has these electrons that want to attack this carton. And it'll make that positive charge there. And the counter ion will be di-dide that came off. But what you find is even though this salt is kind of stable, you can make it even more stable. You can make that viting reagent out of it because you've got a potential illid forming here. So what you can do is take n-butyl lithium. And remember, n-butyl lithium is an ionic compound like this. And what will happen in a deprovening like that? OK, thanks a lot, guys. Any questions?