Cis Trans Isomer
Cis Trans Isomer - Related Videos
02:37
Disubstituted Cyclohexanes: cis-trans Isomerism
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2023
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds. In cyclohexane, the substituents can occupy different positions generating distinct isomers.
02:02
Cis-regulatory Sequences
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2020
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
05:48
Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands
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Cited by 3 •
2018
Complexity of in vivo systems makes it difficult to distinguish between the activation and inhibition of Notch receptor by trans- and cis-ligands, respectively. Here, we present a protocol based on in vitro cell-aggregation assays for qualitative and semi-quantitative evaluation of the binding of Drosophila Notch to trans-ligands vs cis-ligands.
02:18
Constitutional Isomers of Alkanes
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2023
Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism. The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the branched isomers are given...
08:19
Quantitative Comparison of cis-Regulatory Element (CRE) Activities in Transgenic Drosophila melanogaster
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Cited by 15 •
2011
Phenotypic variation for traits can result from mutations in cis-regulatory element (CRE) sequences that control gene expression patterns. Methods derived for use in Drosophila melanogaster can quantitatively compare the levels of spatial and temporal patterns of gene expression mediated by modified or naturally occurring CRE variants.
FAQs
Restricted rotation preserves the relative positions of substituents instead of allowing them to interchange freely. In a carbon-carbon double bond, the rigid arrangement fixes groups on one side or opposite sides. Rings can create the same limitation. Without this structural restriction, the spatial arrangements would not remain distinct long enough to represent separate geometric isomers.
First locate the rigid feature, such as a carbon-carbon double bond or ring, and then compare the positions of the relevant substituents. Groups drawn on the same side correspond to the cis arrangement, while groups on opposite sides correspond to the trans arrangement. This assignment depends on spatial relationships, not on a change in molecular formula or connectivity.
Changing substituent orientation changes the overall three-dimensional distribution of the molecule. As a result, cis and trans forms can have different polarity, boiling points, and melting points even though their atom connectivity remains the same. These property differences help chemists distinguish the isomers and anticipate how molecular shape may influence behavior in chemical or biological settings.
Molecular shape controls how substituents are presented in space, which can change how a compound interacts with its surroundings. The cis and trans forms therefore may show different chemical or biological behavior despite having identical formulas and connectivity. This structural distinction is especially relevant when interpreting the behavior of pharmaceuticals, biomolecules, and functional materials.
Begin by checking that the molecular formula and atom connectivity are unchanged between the structures. Next, identify the double bond or ring that restricts rotation, compare the positions of the relevant substituents, and assign cis when they lie on the same side or trans when they lie on opposite sides. The assignment can then support predictions about physical properties.
Recognition is useful when chemists interpret molecular structures, predict physical properties, or analyze reaction products. Distinguishing the forms can clarify why compounds with the same connectivity show different polarity, boiling point, melting point, or behavior. The comparison also provides structural context for studying pharmaceuticals, biomolecules, and functional materials whose performance may depend on molecular geometry.
Both rings and carbon-carbon double bonds can provide the rigidity needed to preserve different substituent arrangements, but the structural feature being examined differs. For a double bond, compare substituents across the bond; for a ring, evaluate their positions within the ring framework. In either case, the spatial relationship helps explain differences in properties and behavior.