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Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Gas Chromatography: Types of Detectors-II

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

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Related Experiment Video

Updated: Dec 21, 2025

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Published on: September 23, 2013

Cascade Reaction-Based Chemiresistive Array for Ethylene Sensing.

Shinsuke Ishihara¹, Ashish Bahuguna^1,2, Suneel Kumar^1,2

¹International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan.

|May 12, 2020

Summary

This summary is machine-generated.

This study introduces a novel chemiresistive sensor array for detecting ethylene gas. By combining a cascade reaction with single-walled carbon nanotubes, it achieves high sensitivity and selectivity, overcoming limitations in nonpolar substance detection.

Keywords:

Pd catalysts Wacker reaction carbon nanotubes cascade reactions chemiresistors ethylene gas sensors

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Chemiresistive sensors are vital for real-time environmental monitoring.
Detecting nonpolar chemicals with chemiresistive sensors is difficult due to weak doping effects.

Purpose of the Study:

To develop a sensitive and selective method for detecting ethylene in air using a chemiresistive sensor array.
To address the challenges of detecting nonpolar analytes in chemiresistive sensing.

Main Methods:

A cascade reaction (CR) involving a Wacker reaction and condensation with hydroxylamine hydrochloride was employed.
Ethylene was converted to HCl vapor, which acted as a strong dopant for single-walled carbon nanotubes (SWCNTs).
A sensor array with a main sensor and reference sensors partially employing CR was utilized for detection and discrimination.

Main Results:

The main sensor demonstrated excellent sensitivity (10.9% ppm⁻¹) and a low limit of detection (0.2 ppm) for ethylene within 5 minutes.
Reference sensors effectively discriminated false responses from the main sensor.
The system allowed for baseline correction and response recovery without analyte-free air.

Conclusions:

The proposed CR-chemiresistive sensor array offers a robust solution for sensitive and selective ethylene detection.
This approach enhances chemiresistive sensing capabilities for nonpolar substances.
The concept is broadly applicable to overcoming inherent limitations in chemiresistive sensing systems.