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Video Solution: Uscharidin is the common name of a poisonous natural pr...

Problem

Uscharidin is the common name of a poisonous natural product having the structure shown. Locate all of the following in uscharidin: 

(b) Methylene groups 

Video Transcript

Hey everyone. So, in Part B of our question we're going to be looking at our structure and we're going to figure out which, how many methylene groups we have and where are they located, so remember what is a methylene? Well, it's a little bit different than a methyl because it has one less hydrogen, so we're going to say a methylene is characterized by a CH2 group, so remember that we can have CH2 groups that don't necessarily show the hydrogens, which is going to be the case here, so let's take a look how, many methylene groups did you find? in case you're wondering there's actually a total of 10, so if you got 9 or if you got 11 make sure you're paying attention that each carbon can make up the four bonds, so if it has two bonds to it such as this carbon right here, we know that the other two bonds are going to be to our hydrogens, so we're going to have two hydrogens there that's, going to be 1 methylene group, where else you see I see a CH2? Well, here we have a hydrogen, that's not going to be a methylene, that's going to be a methane. So, where else you see them? Well, take a look right here, we have hydrogen, hydrogen, here we have hydrogen, hydrogen, there's two more here, there's going to be two more here, and I'm just going to keep going around, so we expect them to be here, what do you think? here as well, right? H, H, H, H and is that everything or did we miss any? let's see, we have two more here and now let's actually count them all up, because they should be 10, 3 up 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10, let's go ahead and highlight those carbons, this one here, here, all around here, here and finally over here, these are ten methylene groups. Now, hopefully you didn't call any of these methylene because there's only one hydrogen here, there's only one hydrogen there. Now, this double bond up here. Notice that that carbon has three bonds we expect only one hydrogen, this one's not going to have any hydrogens, right? there's going to be nothing there, we can put an O, right? Because you're zeroing there, this one has three bonds, we expect the hydrogen there and notice we have CH3's, we have some CH's but those don't count towards our methylene, so in total let's say we have 10 methylene groups, alright? so I hope this made sense and let me know if you have any questions.

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