E-Z Configaration.pdf

Org.chemistry E-Z configaration

1. A.Illustrate,bymeansofasuitableexample,thelimitations
ofthetermscisandtransinnamingisomericalkenes.
B.UsetheE,Zdesignationtodescribethegeometryofa
givenalkenestructure.
C.IncorporatetheE,Z
designation
intotheIUPACnameofa
givenalkene.
D.DrawthecorrectKekulé,condensedorshorthand
structureofanalkene,givenitsE,Zdesignationplusother
necessaryinformation(e.g.,molecularformula,IUPACname).
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E–Zconfiguration,ortheE–Zconvention,isthe
IUPACpreferredmethodofdescribingtheabsolute
stereochemistryofdoublebondsinorganic
chemistry.Itisanextensionofcis–transisomer
notation(whichonlydescribesrelative
stereochemistry)thatcanbeusedtodescribe
doublebondshavingtwo,threeorfour
substituents.
I would like to express my special thanks of gratitude to my teacher
Dr . Tanmoy Guria, who gave me the golden opportunity to do
this wonderful project of “E-Z Configuration", Who also helped me in
completing my project. I came to know about so many new things I am
really thankful to them. Secondly iwould also like to thank my and friends
who helped me a lot in finalizing this project within the time frame.
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WIKI Pedia
Youtube
Byju’s
Various Books
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Presented By-PREMENDRA ROY
Student of –SOMS , Adamas University, Kolkata -700126
[email protected]
-[phone]
The atoms or groups attached to each olefinic carbon are given priority as per the sequence rule.Ifthe higher priority groups are present on
same sides across the double bond, the geometrical isomer is said to have Z-configuration or 'cis'.Ifthe higher priority groups are present on
opposite sides across the double bond, the geometrical isomer is said to have E-configuration or 'trans’. In the given compound,higher priority
groups are and .When and are present on same sides across the double bond, the geometrical isomer is said to have Z-configuration or 'cis’.
When and are present on opposite sides across the double bond, the geometrical isomer is said to have E-configuration or 'trans'.
METHOD
Stereoisomerism occurs when substances have the same molecular
formula, but a different arrangement of their atoms in space. E-Z
isomerism is one type of this isomerism. It applies to : alkenes and
other organic compounds that contain C=C bonds cyclic alkanes .
You will be able to identify some of the organic compounds you
meet at A Level as cis or trans isomers. However, this naming
system cannot cope with complex situations. For example, where it
is not obvious which groups are on the same side of the C=C bond,
or opposite to each other. This is where the E-Zsystem comes to
the rescue . In A Level Chemistry, you only need to know about E-Z
isomerism due to the presence of a C=C bond.
Geometrical isomers are also called cis-trans isomers. This type
of isomerism is found mostly in alkenes and rarely in alkanes.
Geometrical isomerism describes the presence of two identical
groups (that are attached to the vinyl carbon atoms) positioned
on the same side or the opposite side of the double bond. If the
two identical groups are on the same side, it is called a cis
isomer and if the two identical groups are on the opposite sides,
it is called a trans isomer.