00:05
Part a here asks us to draw the mechanism of this reaction.
00:10
So here we're starting with a ketone and ending with an alcohol on a now fully formed aromatic ring.
00:18
And we're using h2s before to get there.
00:21
So this is an acid.
00:24
So the first step is going to be peronating this carbonyl oxygen here.
00:28
So the first intermediate looks like this.
00:35
Now this is positive.
00:37
And since this positive, we're going to swing this double bond up onto that oxygen to give us an intermediate that looks like this.
00:45
So now the oh is neutral, and we have a positive charge on that carbon.
00:52
And now that carbon is a carbocation and can move around the ring.
00:58
So the first place it can move is if we push this bond over here, that will give us an intermediate that looks like this.
01:10
So this is now over here and now my carbocadion is over there.
01:13
And if i push it one more time to here, now it looks like this.
01:22
And now it's right here...