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Organic Chemistry
D1: In the following organic compound [ in fig -1] ....the QUESTION IS TO IDENTIFY WHETHER THE PAIR IS AN ENANTIOMER OR THEY ARE IDENTICAL...or not. ANSWER GIVEN IS ENANTIOMERS...BUT WHY CAN'T WE ROTATE THE COMPOUND IN THE RIGHT [WHOLE COMPOUND] WITHOUT DISPLACING NEITHER THE BONDS NOR THE ATOMS ,ie , 180 degrees...then we will get the same compound in the right...???
FIG -1:
D2: The question is to mark the asymmetric atoms and give the no: of OPTICAL ISOMERS in the compound HOOC-(COOH)2-COOH...So IF WE DRAW THE DIAGRAM LIKE THE ONE IN THE RIGHT [ OF FIG-2] WE WILL GET A PLANE OF SYMMETRY...BUT IF WE DRAW IT LIKE IN THE LEFT THEN WE WON'T GET A PLANE OF SYMMETRY ...why...or is it my wrong understanding ???
FIG-2:
Comments (7)
2) in any compound there are two 2^n optical isomers.here n is 2.therefore there should hav been 4 optical isomers.
But for the given compound 2 forms( (2) and it's mirror image) are optical isomers.The other two ((2) and its mirror image) are mesomers and are optically inactive.It only has 2 optical isomers.
again tell me if i am right and rate me if useful
they r both the same.rotating out of the plane of paper and rotating like wat u said finally gives a different compound(enantiomer of the given compound)
if u imagine three dimensionally, groups on the horizontal lines point towards u out of the plane of paper and vertical u'll know tht the compound will be diff from the given compound in spatial orientation after 180 degree rotation
experts, please correct if i am wrong
other way to understand this is through (RS) system of nomenclature....if the (RS) nomenclature for both the compounds is same,then,it clearly shows that the two structures are similar....which is true in this case......by the way,is this question taken from any book????????????????????????????
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1)Because ficsure projection formula prevents you from rotating the compounds out of the plane of paper.If you make models of the compound u will realise tht the atoms are in different planes and 180 degree rotations change the relative position of the atoms with respect to each other.
tell me if i am right or wrong.
rate if usefull