00:06
And this problem, we're given this flow chart and asked to identify each of the reagents that should be on each arrow.
00:12
So starting at the top left corner, we're going from an alkyne to an alkan.
00:16
We need a really strong reducing agent.
00:19
So we'll use h2 with pdc.
00:23
To go from an terminal alkyne to an terminal alkyne, we need one of the reagents that will stop at the alkenes.
00:32
So either lindlar's catalyst or sodium and liquid ammonia.
00:35
But because it's a terminal alkyne, we are going to use linlar's catalyst.
00:40
So h .u.
00:41
With the linlar catalyst.
00:43
For the next one, we are adding two bromines and two hydrogens, which means that we need an excess of hbr, especially because those bromines are on the same carbon.
00:57
That's why we can't use br2, because that would put the bromines on opposite carbon.
01:01
So it has to be hbr.
01:02
And then for the next one, now we have one bromine and one.
01:07
One hydrogen, so we're going to use one equivalent of hbr...