00:01
Okay, so in this problem, we're asked to find the best reagents that will make methylbenzy turn into this aldehyde.
00:12
Now, before we begin, i know that we have a proposed set of reagents right here, and i'd just like to go through step by step to see if that's the case.
00:23
What we start off with is going to be a benzene ring with a methyl group attached to it.
00:29
And what i first notice is that whenever we're trying to make an aldehyde from this group, right, because this group is turning into this group, then your ch3 group is going to need some kind of reactive species attached to it.
00:47
Because ch3 by itself is not going to react very well.
00:51
And there's certainly, we don't have a reaction that turns an alkane into an aldehyde directly.
00:55
So the ways we make aldehydes usually is from either carboxylic acids or from alcohols.
01:10
And we usually know how to oxidize alcohol to outlidates, but carbonylaclylic acids, we would probably have to reduce first to an alcohol and then oxidize to an aldehyde.
01:21
So if we could just end up with an alcohol, then that be the best case scenario.
01:26
In order to make an alcohol or alcohol from a methyl group, we'd first have to get some kind of leaving group on here.
01:38
And as we can see from this proposed hbr and light step, we would be able to get from radical catalyzed bromanation, ch2br on there, which would work very well in an s &2 reaction.
01:58
In step two also to give us an alcohol.
02:05
This ring, ch2oh, or that would look something like this, oh, and the br group will leave and be replaced with a hydroxide group or a oh group, which turns into an alcohol.
02:26
So once we have this primary alcohol, then all we have to do, is try to oxidize it from alcohol to aldehyde...