[gabby90]

In trying to see the enantiomers of cis 1-4 diclorocyclohexane, I understand that it does not have a chirality center but how does it have two stereogenic centers? Also, If a molecule does not have chirality, how can cis-trans 1-4 dimethyl can be diastereomers?

Another question is whats the difference between configurational stereisomers and conformatiional stereisomers?

-Thanks for your help

[camptzak]

http://en.wikipedia.org/wiki/Conformational_isomerism

just read the very first paragraph, I think reading more would only confuse, but soon the whole page will be easy reading for you!

http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/sterisom.htm

this is easier reading, and I think you will find it useful.

As for (cis)1,4-dichlorohexane... disregard anything your peers have told you. look carefully at it, make a model, make a model of the mirror image. are there any chirality centers?

http://en.wikipedia.org/wiki/Cis%E2%80%93trans_isomerism

[Dan]

how does it have two stereogenic centers?

It has two pseudoasymmetric centres, which are a type of stereogenic centre. I think your issue here might be understanding the definitions of the terms - good web glossary here.

Also, If a molecule does not have chirality, how can cis-trans 1-4 dimethyl can be diastereomers?

Again, check the definition of diastereoisomers. Stereoisomers ar split into two groups: enantiomers and diastereoisomers (with can be further sub-divided). All stereoisomers that are not related as enantiomers are related as diastereoisomers. E-But-2-ene and Z-but-2-ene are diastereoisomers

Another question is whats the difference between configurational stereisomers and conformatiional stereisomers?

Start by looking up the difference between configuration and conformation.

[pvz]

Can you help me to find a stereogenic centre in this molecule? I can't find it. Thanks.

[Dan]

Can you help me to find a stereogenic centre in this molecule? I can't find it. Thanks.

There are none

[antimatter101]

Yep, there are none.

Can you find a carbon atom with 4 different substituents? no.

Also, search up R-S stereochemistry.

(R stands for remus, S stands for sinister)

[discodermolide]

I think it is rectus, Latin for right.