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![[Post New]](/templates/default/images/icon_minipost_new.gif) 16 Mar 2008 08:47:59 IST
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what is staggered,gauche,eclipsed forms,how to determine their stability??
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Assuming that you know about the newman projections.
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God has given you one face, and you
make yourself another.
~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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16 Mar 2008 09:25:13 IST
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Re:plz explain it
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God has given you one face, and you
make yourself another.
~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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16 Mar 2008 09:25:29 IST
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In general Anti staggered>Gouche>Eclipsed(due to torsional strain)
But if Hydrogen bonding is present as in the case of Glycol then
Gouche>Antistaggered>staggered>Eclipsed
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God has given you one face, and you
make yourself another.
~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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16 Mar 2008 09:58:29 IST
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If the groups attached to the carbons (adjacent carbons)
are at 180degrees then we call that isomer as
Staggered.If it is 60degrees we call it as Gauche.If it is
0degree we call it as Eclipsed.
If the bulky groups are in staggered form,then it is
considered most stable having least potential energy and
called Anti(Anti-Staggered).Eclipsed isomer will have
highest potential energy due to repulsions and torsional
strain and is least stable.
Coming to stability,generally anti will be most stable.
anti>staggered>gauche>eclipsed
In case of H-Bonding,the gauche form will be most stable
because of Intra molecular H-Bonding b/w groups at
60degrees angular separation as shown by Srujana.
Then stability will be Gauche>anti>staggered>eclipsed.
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16 Mar 2008 11:34:45 IST
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in general to the posts made above there is also an imp case to be considered in the case of a chlorohydrin also gauche >staggered >eclipsed here reason is due to dipolar interaction between chlorine and OH group!!!
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