Constitutional Isomers
Constitutional Isomers - Related Videos
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...
01:27
Constitutive and Regulated Gene Expression
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2025
Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
10:03
Development of Leishmania Species Strains with Constitutive Expression of eGFP
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2023
Here, we describe the methodology used for generating L. panamensis and L. donovani strains expressing the gene for eGFP as a stable integrated transgene using the pLEXSY system. Transfected parasites were cloned by limiting dilution, and clones with the highest fluorescence intensity in both species were selected for further use in drug screening assays.
11:44
Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
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Cited by 8 •
2018
Cysteine-rich peptides fold into distinct three-dimensional structures depending on their disulfide connectivity. Targeted synthesis of individual disulfide isomers is required when buffer oxidation does not lead to the desired disulfide connectivity. The protocol deals with the selective synthesis of 3-disulfide-bonded peptides and their structural analysis using NMR and MS/MS studies.
09:34
Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
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Cited by 41 •
2018
Targeted next-generation sequencing is a time- and cost-efficient approach that is becoming increasingly popular in both disease research and clinical diagnostics. The protocol described here presents the complex workflow required for sequencing and the bioinformatics process used to identify genetic variants that contribute to disease.
FAQs
Start by comparing connectivity rather than only atom counts. For a given molecular formula, examine whether the carbon skeleton can be arranged differently, whether a functional group can occupy another position, or whether the atoms can form different functional groups. These alternatives identify distinct constitutional isomers and provide a structural basis for comparing their properties.
Changing connectivity can change both the functional-group identity and the way the compound reacts. Alcohol and ether arrangements can share a molecular formula, yet they represent different functional groups, so their chemical behavior and physical properties may differ. This comparison shows why molecular formulas alone cannot reliably predict a compound’s reactivity or characteristics.
Connectivity is important when interpreting spectroscopic data because compounds with the same formula may contain different structural arrangements. A spectrum must therefore be considered alongside plausible atom connections, carbon skeletons, and functional-group assignments. In practice, distinguishing these alternatives helps chemists determine which structure is consistent with an observed compound rather than treating formula matching as conclusive identification.
To analyze a formula for possible constitutional isomers, first keep the atom inventory fixed, then systematically vary the carbon skeleton, functional-group position, and functional-group identity. Each proposed arrangement should be checked against the original formula and compared as a separate structure. This organized approach reduces missed alternatives and supports later interpretation of properties, reactivity, or spectra.
Chemists use constitutional-isomer analysis when designing or identifying compounds in organic synthesis, pharmaceuticals, and materials research. The same formula can correspond to structures with different behavior, so recognizing the alternatives can guide which compound is being made or examined. It also connects structural planning with the practical need to anticipate properties and chemical responses.
In chemistry, the key outcome is a link between structure and observable behavior. Assigning connectivity helps chemists compare candidate compounds, predict reactions, interpret spectroscopic evidence, and distinguish materials that share a formula. This perspective is especially useful when a molecular formula permits more than one carbon skeleton, functional-group placement, or functional-group arrangement.