chirality 3 and 4

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Created by: anna888
Created on: 03-12-22 17:28

rule for number of stereoisomers in a multichiral molecule

2 to the power of n

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what diastereoisomer

non superimposable non mirror image, same chemical diff physical properties

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what happens when 1 molecule has 2 identical chiral centers? why?

only 3 stereoisomers, meso isomer- two planes of symmetry so achiral

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what is resolution

separation pf entiomers from racemic mixture

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whats classic resolution

react acid enantomer pair with single enantormer base. aslta form which are cyrstalised and filetered at different points due to differning soluilities. salts then reacted iwth acid to give base and single enatomic acid

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what is resolution via esterification

pair of acid enatiomers rect with singl entaomer alchol to form diastereoisomer esters. separated by cyrtsalisation filtration and evaportaion using diff solubilites. acid hydrolysis with each to give single netmer acid and alcohol

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what are stereoselective reactions

preferntonal formation of one stereoisomer over another

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what is stereospecific reactions

reactions with one stereoisomer produced a different stereoisomer

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features of concerted recations

sp3 hybridised carbon, sn2, no intermediate, one product either conserved OR inverted stereocenter, stereoselective

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features of non concerted recations

sp3 hydbrides carbons, sn1, planar carbocation intermdieate, nuc can attack above or below plane so forms enantomers racemic mixture with no stereoselectivity. btter in tertiary as groups stablise postive charge via conjugation

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Other cards in this set

Card 2

Front

what diastereoisomer

Back

non superimposable non mirror image, same chemical diff physical properties

Card 3

Front

what happens when 1 molecule has 2 identical chiral centers? why?

Back

Card 4

Front

what is resolution

Back

Card 5

Front

whats classic resolution

Back

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chirality 3 and 4