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I am very confused when a compound with more than one chiral centre is given. How to find whether the two compounds are enantiomers or diasteromers?

Please also explain how to convert more than one chiral compound with wedge–dash structure to Fischer projection.

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closed as too broad by M.A.R., user55119, Karsten Theis, Mithoron, Todd Minehardt Jun 3 at 0:21

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Where should i start?What are thoughts?what did you attempt? $\endgroup$ – Chakravarthy Kalyan Jun 2 at 8:34
  • $\begingroup$ Sir when chiral centre is given then i can convert by the method that one atoms below.or above the plane of paper are lie on horizontal line and other lie on same plane on a vertical but when it come to more than one chiral centre i am confuse .when question asks predict wether pair entaiomers or something $\endgroup$ – yuvraj singh Jun 2 at 8:51
  • $\begingroup$ Could you edit your question and give an example that you attempted? Also, you are asking two questions, so you should probably post two questions. Otherwise, the title does not match the questions, and it would be difficult to find your second question. $\endgroup$ – Karsten Theis Jun 2 at 10:52
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Method 1 enter image description here

Method 2

Quoting from

http://oscar.iitb.ac.in/OSCARPP/Chemistry/UploadedStoryboards/SCH023_3P0431Wedge-dash%20to%20Fischer.ppt

The following is conversion of molecules with two chiral centres from wedge to fischer projection yhrough a series of operations as shown below.

enter image description here

Reference :

http://oscar.iitb.ac.in/OSCARPP/Chemistry/UploadedStoryboards/SCH023_3P0431Wedge-dash%20to%20Fischer.ppt

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How to find whether the two compounds are enantiomers or diasteromers?

Diastereomers are stereoisomers that are not mirror images of one another and are non-superimposable on one another.$\ce{^1}$

Enantiomers are chiral molecules that are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule.$\ce{^2}$

The figure below will explain.

Further in diastereomers only part of the molecule is a mirror reflection.(circled in the image) ,while the other stereo-center is identical.

NOTE:Geometrical isomers are also diasetreisomers , but achiral.In the examples given below Diastereomers are chiral.

enter image description here

References:

  1. http://www.chemeddl.org/resources/stereochem/definitions17.htm

2.http://www.chemeddl.org/resources/stereochem/definitions16.htm

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