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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

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Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
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Room-Temperature Catalyst Enables Selective Acetone Sensing.

Ines C Weber1, Chang-Ting Wang1, Andreas T Güntner1,2

  • 1Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.

Materials (Basel, Switzerland)
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Summary
This summary is machine-generated.

Room-temperature catalytic filters enhance gas sensor selectivity for acetone detection. These filters operate efficiently at low temperatures, enabling integration into portable devices for health monitoring.

Keywords:
combustion synthesiselectronicsmetal oxidesnanotechnologynoble metalssemiconductors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Gas sensors require high selectivity for accurate detection in various applications.
  • Existing catalytic filters need high operating temperatures, limiting their use in low-power devices.
  • Acetone is a key breath marker for monitoring body fat burn.

Purpose of the Study:

  • To develop room-temperature catalytic filters for highly selective acetone sensing.
  • To investigate the effect of platinum (Pt) content on filter performance.
  • To enable integration of selective gas sensing into low-power, mobile health devices.

Main Methods:

  • Flame spray pyrolysis was used to synthesize Al2O3 nanoparticles decorated with Pt/PtOx clusters.
  • X-ray diffraction and electron microscopy characterized the nanoparticle size and composition.
  • Mass spectrometry quantified the removal of interferent gases and preservation of acetone.
  • Chemo-resistive Si/WO3 sensors were combined with the catalytic filters.

Main Results:

  • Pt content above 3 mol% in Al2O3 nanoparticles effectively removed methanol, isoprene, and ethanol at 40 °C.
  • Acetone was largely preserved while common interferents were eliminated, even at high relative humidity.
  • The catalytic filter combined with a Si/WO3 sensor achieved high acetone selectivity (≥225) over multiple interferents.
  • The system demonstrated effective detection of acetone in the presence of H2, CO, aldehydes, and alcohols.

Conclusions:

  • Room-temperature catalytic filters offer a low-power solution for selective gas sensing.
  • These filters are suitable for integration into mobile health devices for applications like breath analysis.
  • The developed technology advances selective gas detection for medical, environmental, and food safety applications.