DAT ORGO 3 - sterochemistry

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Last updated 6:26 AM on 5/30/26
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16 Terms

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constitutional isomers

molecules with the same formula, but different conectivity

<p>molecules with the same formula, but different conectivity </p>
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enatiomers

non superimposable mirror images

e for Everything opposite

<p>non superimposable mirror images </p><p></p><p>e for Everything opposite </p>
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diastereomers

non superimposable, non mirror images

only some different

<p>non superimposable, non mirror images</p><p></p><p>only some different </p>
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Rs naming system

  1. find stereocenter carbon

  2. prioritize the four apendages in term of ATOMIC NUMBER, then branch out (double bonds count as two)

  3. Nubmber substientuents at priority

  4. Face 4 away from you, and count direction r=right, S = left

<ol><li><p>find stereocenter carbon</p></li><li><p>prioritize the four apendages in term of ATOMIC NUMBER, then branch out (double bonds count as two)</p></li><li><p>Nubmber substientuents at priority </p></li><li><p>Face 4 away from you, and count direction r=right, S = left</p></li></ol><p></p>
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Types of diastereomers

Cis trans rings

cis/trans or E/Z isomers

Stereoisomers that dont have the same RS configurations

<p>Cis trans rings</p><p>cis/trans or E/Z isomers</p><p>Stereoisomers that dont have the same RS configurations </p>
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How to calculate number of stereoisomers

2^n

where n=number of stereocenters

<p>2^n </p><p></p><p>where n=number of stereocenters</p>
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chirality

the ability to rotate plane polarized light in a polarimeter

When they rotate it counterclockwise its L, and when they rotate it clockwise its D

<p>the ability to rotate plane polarized light in a polarimeter</p><p></p><p>When they rotate it counterclockwise its L, and when they rotate it clockwise its D</p>
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How do enatiomers rotate light

the same way, but in different directions

<p>the same way, but in different directions</p>
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Achiral molecules

molecules that dont rotate plane polarized light

<p>molecules that dont rotate plane polarized light</p>
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What counts as an achiral molecule

molecules that do not have stereochemistry

A fifty - fifty mixture of enatiomers (since they rotate in the opposite way)

Meso compounds

<p>molecules that do not have stereochemistry</p><p>A fifty - fifty mixture of enatiomers (since they rotate in the opposite way)</p><p>Meso compounds</p>
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What are the physical properites of enatiomers

they have the same physical propertie, and can only be seperated in chiral seperation conditions

<p>they have the same physical propertie, and can only be seperated in chiral seperation conditions </p>
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What are the physical properites of diastereomers

they have different physical properties

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meso compounds

molecule with two or more stereocenters and can be bisected by a line of symmetry DO NOT HAVE ENANTIOMERS

<p>molecule with two or more stereocenters and can be bisected by a line of symmetry DO NOT HAVE ENANTIOMERS </p>
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what is part of the reason meso compounds are achiral

The stereocenters on opposing sides are R and S (opposing)

<p>The stereocenters on opposing sides are R and S (opposing)</p>
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Fischer projections

vertical bonds - away

horizontal bonds - towards us

<p>vertical bonds - away</p><p>horizontal bonds - towards us </p>
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whats another name for stereocenter

assymetrical carbon