STEREOCHEMISTRY
...und with the same molecular formula, but different structural formula and different IUPAC name. The two can be distinguish by a simple test :”the IUPAC name of constitutional isomers are different, the IUPAC name for stereoisomers are the same.” Stereoisomers can be divided into two main classes: conformational stereoisomers and configurational stereoisomers. Molecules that cannot be superimposed on the mirror images are called chiral molecules. Pairs of molecule that exit as nonsuperimposable mirror images of each other are enationmers. Compound having structures that are superimposable on their mirror images are achiral. An atom that is connected to four different substituent group is called an asymmetric atom or a steriocenter atom. Molecule with one stereocenter are always chiral. When a plane polarized light is passed through a sample of one of the enantiomersl, the plane of polarization of the incoming light is rotated in one direction( either clockwise or counterc...