Stereoisomers
Stereoisomers - Related Videos
02:32
Stereoisomers
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2023
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
08:51
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Cited by 5 •
2017
For small chiral species, Coulomb Explosion Imaging provides a new approach to determine the handedness of individual molecules.
02:52
Stereoisomerism
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2020
Isomerism in Complexes Isomers are different chemical species that have the same chemical formula. Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
06:31
Organocatalysis
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2023
Source: Vy M. Dong and Faben Cruz, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the concept of organocatalysis by illustrating the proper setup of a reaction that utilizes enamine catalysis. Organocatalysis is a form of catalysis that uses substoichiometric amounts of small organic molecules to accelerate reactions. This type of catalysis is complementary to other forms of catalysis such as transition metal or biocatalysis. Transition metal...
14:21
Nucleophilic Substitution
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2023
Source: Vy M. Dong and Daniel Kim, Department of Chemistry, University of California, Irvine, CA Nucleophilic substitution reactions are among the most fundamental topics covered in organic chemistry. A nucleophilic substitution reaction is one where a nucleophile (electron-rich Lewis base) replaces a leaving group from a carbon atom. SN1 (S = Substitution, N = Nucleophilic, 1 = first-order kinetics) SN2 (S = Substitution, N = Nucleophilic, 2 = second-order kinetics) This video will help to...
FAQs
Enantiomers form non-superimposable mirror-image pairs, whereas diastereomers are stereoisomers that do not constitute mirror-image pairs. This distinction gives chemists a framework for comparing spatial arrangements within a set of compounds. It also helps organize structure determination and reaction analysis, because members of the two categories can show different physical properties, reactivity, or behavior in biological environments.
Distinct forms arise when molecular rotation or bonding constraints prevent atoms from adopting freely interchangeable spatial arrangements. The atom-to-atom connectivity can remain unchanged while the three-dimensional configuration differs. These constraints matter because spatial structure then becomes a determining factor in chemical behavior, including differences in polarity, reactivity, and interactions with other molecules.
Chiral environments, including enzymes and receptors, interact with molecules according to their three-dimensional arrangement. Consequently, stereoisomers that share molecular formula and connectivity may not produce equivalent biological responses. This selectivity is scientifically important because one spatial form can show the desired activity, while another may have reduced activity or different biological consequences.
Stereoisomer analysis helps chemists determine which three-dimensional arrangement is consistent with a molecule's observed chemical behavior. Comparing possible configurations can clarify structural assignments beyond molecular formula and atom-to-atom connectivity alone. The resulting information supports molecular structure determination and provides a basis for interpreting differences in polarity, reactivity, and interactions with chiral environments.
Reaction design must account for the possibility that different spatial arrangements will behave differently during chemical transformations. Analyzing stereoisomers lets chemists connect a chosen molecular configuration with differences in reactivity and other chemical properties. This consideration is especially relevant when the goal is to prepare a particular form rather than treat all compounds with the same connectivity as equivalent.
Pharmaceutical research examines stereoisomers separately because biological targets such as enzymes and receptors are chiral environments. One stereoisomer may produce the desired therapeutic effect, while another may have reduced activity or different biological consequences. Identifying and evaluating these forms therefore supports the preparation of compounds whose spatial structure is appropriate for the intended pharmaceutical outcome.