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Cross-reactivity

Cross-reactivity

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

The reaction between two different carbonyl compounds comprising α hydrogen in the presence of a strong base like lithium diisopropylamide (LDA) to form a crossed aldol product is known as a directed aldol reaction. The directed aldol reaction is depicted in Figure 1.

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

Crossed Aldol Reactions: Overview

Crossed Aldol Reactions: Overview

Crossed aldol addition is the reaction between two different carbonyl compounds under acidic or basic conditions. Here, both the carbonyl compounds function as nucleophiles and electrophiles. As shown in Figure 1, such a reaction yields a mixture of products, two of which are formed via self-condensation, while the remaining two are formed via crossed-condensation. Without adjustment, the reaction's usefulness in organic chemistry is decreased.

Three-Phase Voltages

Three-Phase Voltages

A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...

Consecutive Reactions

Consecutive Reactions

Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...

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Related Experiment Video

Updated: Jul 9, 2026

Design and Use of Multiplexed Chemostat Arrays

Design and Use of Multiplexed Chemostat Arrays

Published on: February 23, 2013

Cross-reactive arrays based on three-way junctions.

Milan N Stojanović¹, Eric G Green, Stanka Semova

¹Division of Clinical Pharmacology and Experimental Therapeutics, Department of Medicine, Columbia University, New York, New York 10032, USA. mns18@columbia.edu

Journal of the American Chemical Society

|June 6, 2003

Summary

This study introduces a new system using fluorescent sensors to identify hydrophobic molecules in solutions. These sensors create unique fingerprints to detect steroids, with potential for clinical use in diagnosing steroidogenesis disorders.

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Area of Science:

Biochemistry
Molecular Biology
Analytical Chemistry

Background:

Characterizing hydrophobic molecules in solution is challenging.
Oligonucleotide-based sensors offer a promising approach for molecular recognition.
Existing methods may lack the sensitivity or specificity for complex biological samples.

Purpose of the Study:

To develop a novel system for parallel processing of molecular recognition events.
To create oligonucleotide-based fluorescent sensors for characterizing hydrophobic molecules.
To demonstrate the system's utility in identifying steroids in biological fluids.

Main Methods:

Designed oligonucleotide sensors with three-way junctions for stable folding.
Incorporated a reporting domain via phosphorothioate substitution and fluorophore attachment.
Organized sensors into cross-reactive arrays to generate molecular fingerprints.

Main Results:

The sensor system successfully characterized hydrophobic molecules in solution.
Generated unique fingerprints for identifying specific steroids.
Demonstrated potential for analyzing complex biological fluids like blood.

Conclusions:

The developed sensor array system enables parallel processing of molecular recognition.
This technology can accurately characterize hydrophobic molecules, including steroids.
Potential clinical applications include early detection of steroidogenesis defects.