L9 - Stereochemistry 2
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How do you change configurational isomers? what are they?
• by breaking bonds • they are different compounds
What is an example of geometric isomers?
Trans-but-2-ene (E) Cis-but-2-ene (Z)
when is a molecule chiral?
a molecule is chiral if does not have a plane of symmetry within
what are enantiomers?
mirror images of each other - have identical physical properties - they rotate plane polarised light in equal but opposite directions
What is - or l?
Levorotatory PPL anti-clockwise
what is + or d?
dextrotatory PPL clockwise
how do you calculate [alpha]D?
observed rotation (alpha) / (path length (dm) x conc (g/mol))
what is the [alpha]D for a racemic mixture?
0 as it’s 50/50 mixture of 2 enantiomers
what is enantiomeric excess (ee)?
the excess of one enantiomer over another
how do you calculate ee?
x-y/x+y