2-adduct
2-adduct - Related Videos
07:52
Removal of Branched and Cyclic Compounds by Urea Adduction for Uk'37 Paleothermometry
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst As mentioned in previous videos, the product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. In the case of our two organic paleothermometers (Uk'37 and MBT/CBT), the interest is in only 6 compounds (2 alkenones and 4 isoprenoidal glycerol dialkyl glycerol...
11:46
Single Molecule Analysis of Laser Localized Psoralen Adducts
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2017
Lasers are frequently used in studies of the cellular response to DNA damage. However, they generate lesions whose spacing, frequency, and collisions with replication forks are rarely characterized. Here, we describe an approach that enables the determination of these parameters with laser localized interstrand crosslinks.
09:33
Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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Cited by 3 •
2018
Evaluating the potency of environmental chemicals and drugs, to be enzymatically bioactivated to intermediates generating covalent DNA adducts, is an important field in the development of cancer and its treatment. Methods are described for compound activation to form DNA adducts, as well as techniques for their detection and quantification.
01:13
meta-Directing Deactivators: –NO2, –CN, –CHO, –CO2R, –COR, –CO2H
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2023
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...
01:20
2° Amines to N-Nitrosamines: Reaction with NaNO2
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2023
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion. Figure 1. The nitration reaction of secondary amines The...
FAQs
These processes provide different ways for the two additional components to associate with the original molecule. Coordination reflects attachment through interactions with a chemical center, protonation adds protonic character, and ion pairing links oppositely charged species. Because each route changes composition and interactions differently, distinguishing the formation pathway can help explain the observed properties and spectral behavior.
If the original framework remains intact, the additional atoms, ions, or groups can be interpreted as associated components rather than evidence of complete molecular breakdown. This distinction helps chemists connect the altered composition to the starting structure, evaluate plausible formation pathways, and use the resulting species to investigate intermolecular interactions or molecular recognition.
Association with two additional components changes the species' composition and therefore its mass-to-charge ratio. The resulting ion can produce a characteristic spectral signal that differs from signals associated with the original molecule. Chemists examine this altered ratio as evidence for the associated species, supporting molecular-structure identification and interpretation of reaction-related behavior.
A characteristic mass-to-charge ratio provides an analytical signature for the associated species. When interpreted alongside the original molecular composition, it can indicate that two additional atoms, ions, or molecular groups are present. This evidence helps distinguish possible molecular structures and strengthens assignments made during mass-spectral analysis, although the ratio must be considered within the relevant chemical context.
Analysis begins by examining the species detected in a mass spectrum and identifying a signal consistent with the altered composition. Chemists then relate its mass-to-charge ratio to the original molecule and consider whether coordination, protonation, or ion pairing provides a plausible formation pathway. This workflow supports structural assignments and can reveal associations relevant to the compound's behavior.
They are useful when researchers need to characterize compounds, interpret mass spectra, or examine how molecules associate with other chemical species. In analytical chemistry, they assist identification; in coordination chemistry, they help investigate associations involving chemical centers; and in molecular-recognition studies, they provide evidence about intermolecular interactions and how molecular partners relate to one another.
A detected 2-adduct can serve as evidence that specific additional components associated with a molecule during a chemical process. Relating its composition and characteristic mass-to-charge ratio to the original species helps researchers consider how the association formed and what interactions stabilized it. This makes the species useful for interpreting possible reaction pathways without requiring loss of the original molecular framework.