are enantiomers the same molecule?
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Enantiomers are chiral molecules that are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. ... Therefore, these molecules are enantiomers.
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D and L enantiomers refer to the configurational stereochemistry of the molecule. L isomers have the hydroxy group attached to the left side of the asymmetric carbon furthest from the carbonyl, while D isomers have the hydroxy group on the right side.
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ENANTIOMERS ALWAYS HAVE OPPOSITE R,S DESIGNATIONS. By “opposite” I mean they have the same names, but their R's and S's are reversed. ... If you've got a chiral molecule with two stereocenters and the configuration is (R,S), the enantiomer will have the (S,R) configuration.
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Stereoisomers that are not enantiomers are called diastereomers. where x is the number of possible isomers and n is the number of chiral centers. Thus, for molecules with two chiral centers there are four possible stereoisomers. (e.g. cholesterol, which has eight stereogenic centers, has 256 possible stereoisomers!! )
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Hence, a meso compound is a stereoisomer of its optically active isomers. When you draw the two mirror image isomers of a meso compound, you are just looking at different views of the same compound. A meso compound is a single compound. You can't separate it into two different compounds.
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A stereocenter is any atom in a molecule for which exchanging two groups creates a different stereoisomer. All chiral centers are stereocenters, however, not all stereocenters are chiral centers as we will encounter examples of this in later chapters. Do not sweat this detail at this point.
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Stereoisomers that differ at some stereocenters but not at others are not mirror images, so they are not enantiomers. Instead, they are diastereomers. A diastereomer is simply any stereoisomer that is not an enantiomer. Technically, cis-trans isomers are diastereomers.
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Constitutional Isomers: Two molecules with the same composition but different constitution (i.e. – same molecular formula, different IUPAC name for constitution). ... Conformational Isomers (Conformers): Two molecules with the same configuration but different conformation.
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Enantiomers, also known as optical isomers, are two stereoisomers that are related to each other by a reflection: they are mirror images of each other that are non-superposable.
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Isomers are compounds with different physical and chemical properties but the same molecular formula. ... Structural isomers have the same molecular formula but a different bonding arrangement among the atoms. Stereoisomers have identical molecular formulas and arrangements of atoms.
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Figure 10-4. The aldotetroses contain two chiral carbon atoms, each of which may exist in an R- or S- form, giving rise to four stereoisomers. The two erythrose isomers are mirror images (enantiomers), as are the two threose isomers. Each erythrose is a diastereomer of the threoses, and vice versa.
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Structural isomers have the same molecular formula but a different bonding arrangement among the atoms. Stereoisomers have identical molecular formulas and arrangements of atoms. They differ from each other only in the spatial orientation of groups in the molecule.
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1. Yes. All enantiomers are optically active. Optical activity is like one of the definitions of enantiomers, because enantiomers are the isomers of the molecule which are non super imposable mirror images of each other and rotate light in opposite directions.
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Cis-trans isomers are stereoisomers, that is, pairs of molecules which have the same formula but whose functional groups are rotated into a different orientation in three-dimensional space. It is not to be confused with E–Z isomerism, which is an absolute stereochemical description.
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Identical means exactly the same or which cannot be be differentiated. Where as enantiomer means non identical (we can differentiate them) and are reverse of each other that is mirror images.
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Isomers are molecules that have the same molecular formula, but have a different arrangement of the atoms in space. That excludes any different arrangements which are simply due to the molecule rotating as a whole, or rotating about particular bonds. For example, both of the following are the same molecule.
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Isomers always have the same chemical formula. ... Structural (constitutional) isomers have the same molecular formula but a different bonding arrangement among the atoms. Stereoisomers have identical molecular formulas and arrangements of atoms.