 Okay, so let's try this one, this one's for you Angel, it says show the mechanism of the reaction between benzaldehyde and benzol triphenyl phosphonium chloride with 10 molar sodium hydroxide and dichloromethane to produce cis-stilby, okay? So we just want to produce the cis-stilby, and here's the conditions, of course 10 sodium hydroxide and dichloromethane, so we're going to erase this portion and just show the mechanism, okay? So recall the phosphonium salt, this is the important part, we've got the two hydrogens there, okay? So those hydrogens are acidic and when we add hydroxide of course that's going to deprotonate one of those protons there, okay? So when we do that we're going to form, so this is just one of the resonance forms, we'll keep it like this for ease of showing the mechanism, the carbanion in there. So we have that, we formed water also, so remember that's the phosphonium illid that we're going to use to react, so I'm going to erase this portion, is it okay if I erase this? Yeah. Okay, wonderful. So we have this now, let's move the benzaldehyde closer so we can see the reaction, of course it's like right there on that. So remember oxygen or phosphorus is oxyphilic, so and also remember the carbanion is going to attack the carbonyl carbon like nobody's business, so we're going to have a concerted reaction here to form the cis stillbeam, so we're going to attack there and the electrons from the carbonyl double bond are going to attack the phosphorous there. So we have that, the oxyphosphatene, of course this four-membered ring is very unstable so it's going to break down quite readily, so what's going to happen is this bond is going to go there, this bond is going to go there and then you're going to have to get all of the byproduct out, it's not the easiest thing, but anyways you'll see that when you do the reaction today. Hopefully you can see since it's a concerted reaction we're going to get the cis. If you recall what it says in the procedure, it also says you're going to get some of the trans stillbeam but that comes from a different mechanistic pathway, so this is the pathway to the cis stillbeam. So are there any questions on this one? Pretty straightforward, right? Yeah. Okay, I wonder.