is this E OR Z ISOMERISM

TheGreaterGood

7

please see attached

ez isomerism.png4.8KB

Reply 1

Munrot07

18

Z :P

(edited 10 years ago)

Reply 2

MidnightDream

16

I'm going to say E isomerism :smile:

EDIT: I think it may be Z actually as the ethyl group is a higher priority than the methyl group, and the other methyl group is higher than the hydrogen

(edited 10 years ago)

Reply 3

L'Evil Fish

18

E.

Z = Zame side (same)
E = the other one :lol:

Reply 4

toonervoustotalk

20

E because it is oposite sides.

E means trans and Z means cis

Posted from TSR Mobile

Reply 5

L'Evil Fish

18

Original post by toonervoustotalk

E because it is oposite sides.

E means trans and Z means cis

Posted from TSR Mobile

another way is

Trans = trans Atlantic = e opposite ends

Reply 6

Kallisto

Entertainment Forum Helper

22

As far as I can see the functional groups are the methyl groups (CH3 or H3C) which are opposed to each other, that's why it is E isomerism. See here to compare:

http://mcat-review.org/geometric.gif

Reply 7

Kallisto

Entertainment Forum Helper

22

Original post by L'Evil Fish

E.

Z = Zame side (same)
E = the other one :lol:

Original post by L'Evil Fish

another way is

Trans = trans Atlantic = e opposite ends

They are good devices to aid memory, aren't they? In the same way I memorise the positions.

(edited 10 years ago)

Reply 8

Rock_Set

2

I'd have thought Z because the ethyl is on the same side as the methyl therefore the 2 highest priority groups are on the same side :s-smilie:

Bottom right
http://www.docbrown.info/page07/addhoc07/EZisomerism1.jpg

(edited 10 years ago)

Reply 9

L'Evil Fish

18

Original post by Rock_Set

I'd have thought Z because the ethyl is on the same side as the methyl therefore the 2 highest priority groups are on the same side :s-smilie:

Bottom right
http://www.docbrown.info/page07/addhoc07/EZisomerism1.jpg

Oh you may have a point.

Reply 10

F.R.A.W.A

E=enemies, that's how I remember it

It's Z.

Geez guys, I really can't believe everyone here said the wrong answer. Despite the fact you have two equal groups (the methyl ones), the priority rules don't really care about that. What actually matters is which group has highest priority on each side. On the left side the ethyl group has a highest priority, because the carbon is attached to 2 hydrogens and a carbon, as opposed to 3 hydrogens. On the right side you have the lowest possible priority "group" - the H atom, thus making the methyl group highest priority on the right side. As you can see, both highest priority groups lie on the same side, thus they are Z (from German "zusammen" - together)

Reply 13

chukster97

17

its z, the largest groups are on the same side so its z

Reply 14

Rock_Set

2

Original post by Godzilla123

Geez guys, I really can't believe everyone here said the wrong answer. Despite the fact you have two equal groups (the methyl ones), the priority rules don't really care about that. What actually matters is which group has highest priority on each side. On the left side the ethyl group has a highest priority, because the carbon is attached to 2 hydrogens and a carbon, as opposed to 3 hydrogens. On the right side you have the lowest possible priority "group" - the H atom, thus making the methyl group highest priority on the right side. As you can see, both highest priority groups lie on the same side, thus they are Z (from German "zusammen" - together)