YOU CANNOT CREATE A CHIRAL RESULT
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YOU CANNOT CREATE A CHIRAL RESULT BY REACTION OF TWO ACHIRAL SUBSTANCES. Examples using the stereospecific cis- hydrogenation reaction ….. that is – a syn addition. INTERACTION OF ACHIRAL OBJECTS GIVES AN ACHIRAL RESULT. meso. achiral catalyst. achiral. top.

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You cannot create a chiral result by reaction of two achiral substances

YOU CANNOT CREATE A CHIRAL RESULT

BY REACTION OF TWO ACHIRAL SUBSTANCES

Examples using the stereospecific

cis-hydrogenation reaction

….. that is – a syn addition


You cannot create a chiral result by reaction of two achiral substances

INTERACTION OF ACHIRAL OBJECTS GIVES AN ACHIRAL RESULT

meso

achiral catalyst

achiral

top

achiral

planar alkene

(cis)

50/50 but:

IDENTICAL

both meso

bottom

achiral catalyst

achiral

meso

NOT A CHIRAL RESULT


You cannot create a chiral result by reaction of two achiral substances

INTERACTION OF ACHIRAL OBJECTS GIVES AN ACHIRAL RESULT

achiral catalyst

top

achiral

planar alkene

(trans)

Racemic Mixture

50/50

Enantiomers

bottom

achiral catalyst

A RACEMIC MIXTURE IS

NOT A CHIRAL RESULT

(you do not get a specific enantiomer)


You cannot create a chiral result by reaction of two achiral substances

INTERVENTION OF A CHIRAL INTERMEDIARY GIVES A CHIRAL RESULT

not

formed

specific

binding

Enzyme (chiral) blocks top side

X

Me

Et

achiral

alkene

one

enantiomer

achiral catalyst or

an achiral reagent

CHIRAL RESULT


You cannot create a chiral result by reaction of two achiral substances

INTERVENTION OF A CHIRAL INTERMEDIARY GIVES A CHIRAL RESULT

not

formed

X

alkene only fits

one way into

active site

Me

one

enantiomer

Me

chiral catalyst

enzyme is

the reagent

CHIRAL RESULT