There can be several structural formulas for a single molecular formula. These are known as isomers. Isomers can be defined as "different compounds that have the same molecular formula." There are mainly two types of isomers called constitutional isomers and stereoisomers. For example, C4H10 can have following constitutional isomers.
Constitutional isomers are "isomers that differ because their atoms are connected in a different order." Stereoisomers are isomers that differ from the spatial arrangement of the atoms. Diastereomers and enantiomers are the two types of stereoisomers.
Diastereomers
Diastereomers are stereoisomers whose molecules are not mirror images of each other. For example, cis and trans isomers are Diastereomers.
In the above two compounds, the connectivity of atoms is same. Both compounds have a carbon- carbon double bond. And for each carbon, a chlorine atom and a hydrogen atom is connected. Cis and trans molecules differ only from the way atoms are arranged in the space. That is, in cis isomer, both hydrogens are on the same side of the carbon double bond. But in the trans isomer, hydrogen atoms are on either side of the carbon double bond. And the two structures are not mirror images of each other. Therefore, they are Diastereomers. However, cis and trans molecules are not the only kind of diastereomers we can find.
Enantiomers
Enantiomers are "stereoisomers whose molecules are nonsuperposable mirror images of each other. " Enantiomers are only possible with molecules, which are chiral. Chiral molecule is the one that is not identical with its mirror image. For a molecule to be chiral, it should have one tetrahedral atom with four different groups attached to it. This carbon atom is known as a stereocenter. Chiral molecules make mirror images that are not superposable. So the molecule and the mirror image are said to be enantiomers. Following is an example of a compound that forms enantiomers.
The enantiomers are named using the R and S system. So, according to the system the molecule on the right hand side is (S)-2-butanol, and the other one is (R)-2-butanol. Enantiomers don't have different boiling points, melting points, solubilities, different infrared spectra etc. All these chemical and physical properties of enantiomers are similar because intermolecular forces are similar in both isomers. They become separate only by their different behaviors towards the plane polarized light. That is, enantiomers rotate the plane of the plane polarized light in opposite directions. However, they rotate the light in equal amounts. Because of their effect on the polarized light, enantiomers are said to be optically active. The equimolar mixture of two enantiomers is called a racemic mixture. Racemic mixture doesn't show any rotation of the polarized light, therefore it is optically inactive.
what is difference between enantiomers and diasteioomers
Mainly because enantiomers have identical physical and chemical properties. However, the difference between two enantiomers can have tremendous impact, especially in biological systems, because many important biological molecules are chiral.
Epimers are those carbons that have "H" and "OH" are present and they can change their position Enantiomers are special type of isomer these are mirror image to each other
Yes, it can. There are two glycerol enantiomers, depending on the position of OH group on the second carbon atom.
The ring form has 8 enantiomers, the open form 4.
The carbonyl group present in aldehydes or ketones itself is optically inactive but if a carbon attached to carbonyl group is asymmetric (attached to four different groups or atoms) then such compound may show to enantiomers as there are two enantiomers of CH3-CHCl-CHO.
Mainly because enantiomers have identical physical and chemical properties. However, the difference between two enantiomers can have tremendous impact, especially in biological systems, because many important biological molecules are chiral.
Epimers are those carbons that have "H" and "OH" are present and they can change their position Enantiomers are special type of isomer these are mirror image to each other
Yes, it can. There are two glycerol enantiomers, depending on the position of OH group on the second carbon atom.
1:1 molar solution of two enantiomers is recemic mixture and it may be resolved into two parts by chemical means while mesoform is a pure substance and can not be resolved, but both these are optically inactive.
Aldoheptoses have seven carbon atoms and one chiral center, so they can have a maximum of 2^1 = 2 enantiomers.
Chiral molecules have mirror-image isomers
enantiomers
Enantiomers..
The specific rotation is +123 and -123 degrees for the (+) and (-) enantiomers respectively
its called a racemic mixture and is optically inactive
According to the Fischer projection formula, they are enantiomers.
According to the Fischer projection formula, they are enantiomers.