3. Consider rotation about the C3-C4 bond of hexane, and...

3. Consider rotation about the C3-C4 bond of hexane, and draw the Newman projection for the most stable conformation. 4. Draw isopropylcyclohexane in a chair conformation and then draw its ring flipped isomer (Draw the two chair conformations). Label the substituent as either axial or equatorial. Indicate which of the conformers is more stable.

Transcript

00:01 Okay, we're talking about hexane, so let's draw hexane.

00:04 Two, three, four, five, six.

00:06 And we're talking about the three -four bonds.

00:08 So that's carbon -three, that's carbon -four.

00:10 All right, so we're talking about this bond here.

00:12 Let's consider looking down it from this direction.

00:16 And note that we would have a wedge to a hydrogen here, as well as a dash to hydrogen here.

00:26 And that on carbon four, we would also have a wedge and a dash -to -hydrogen.

00:31 To hydrogen and a dash to hydrogen.

00:34 Okay.

00:35 And that the groups coming off of c3 and c4 are ethyl groups, right? that's an ethyl, c .h2, ch3.

00:43 This is an ethyl, ch2, ch3.

00:46 Okay.

00:47 So we're looking at it from here.

00:49 It looks like i've got straight up.

00:51 There's an ethyl.

00:53 And then down into the right.

00:54 It's hydrogen down to the left.

00:59 And the back looks like from this point of view, the rear ethyl is straight down.

01:07 Okay.

01:08 And up into the right, i have hydrogen, and up into the left i have hydrogen.

01:13 And luck would have it.

01:14 This just is the most stable confirmation.

01:17 Okay.

01:18 How do i know that? well, because it's staggered, right? staggered is always better than eclipse.

01:23 There's nothing that's staggered that's going to be higher energy than eclipse...

Question

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